The 7 Best Insulated Jackets of 2025 | GearJunkie Tested

The best synthetic jackets avoid the main weakness of down insulation by remaining functional and warm when wet. Though synthetic jackets may not have the same warmth-to-weight ratio as their down counterparts, they are usually more breathable and cheaper. They’re what we reach for when we need a layer to power us through active pursuits like backcountry or nordic skiing. climbing, mountain biking, and hiking.

Our team collectively tested dozens of these jackets to create our list of the best synthetic insulated jackets. Current authors Chris Kassar, Ryan Kempfer, and Andrew Potter put countless models through grueling tests in the past year alone.

We dangled off jugs thousands of feet in the air, skinned up thousands of switchbacks, skied down countless backcountry runs, ran, rode, hiked miles of trails, and even huddled around a few campfires with these synthetic layers to bring you the streamlined selection you see today. We evaluated each jacket based on fit, comfort, durability, breathability, packability, and value.

Whether you’re seeking the top performance of our overall pick, the Arc’teryx Atom Hoody, or a budget-friendly jacket like the Cotopaxi Capa Hybrid Insulated Hooded Jacket, we have all the options you need.

Editor’s Note: We updated this guide on March 20, 2025, by adding our favorite lightweight synthetic jacket, the Outdoor Research SuperStrand LT Hoodie.

The lightweight cousin of the popular Atom AR, the Atom Hoody ($300) is a time-tested classic for high-output adventures and is one of our favorite active insulators on the market. How often you snag a jacket from the closet while running out the door for spontaneous adventures is a good indicator of how solid it is, and we grab this one pretty much every time.

As a hardworking midlayer or a standalone piece in milder temps, there are few jackets out there that have better mobility, are comfier, or boast greater warmth-to-weight ratios. The versatility of this thing is really where it shines.

While not quite as breathable as others, the Atom scored high points in our book for its ability to be worn during intense activity in cold climates while also packing a solid amount of heat into a sleek, stylish design. We love that you can take this jacket on fast, cold-weather excursions or climbs without having to compromise warmth and weather/wind resistance like a lot of other active insulators.

The gusseted underarms, stretchy sides, and athletic fit allow the jacket to move with you phenomenally, and the interior fabric is soft and comfortable. You’ll be wearing this thing all day. Couple this with thoughtful features such as fleece-lined pockets, an adjustable hood, and improved cuffs, and well, that’s why Arc’teryx is tough on the wallet.

For speedy adventures in the wild where solid breathability with maximum warmth is required or for trotting confidently through town, it’d be difficult to find a better jacket. We think it’s just about the best synthetic insulated jacket on the market.

Looking to change the way you layer? Then the Cotopaxi Capa Hybrid Insulated Hooded Jacket ($180) is the piece for you. The hybrid fabric combo is unique and thoughtfully placed. Knit panels on your sides and sleeves add mobility, making climbing, running, and using ski poles a breeze.

At the same time, cozy PrimaLoft Gold P.U.R.E. insulation on your chest and back adds warmth to your core, where you need it most (and nowhere you don’t!).

We wore this jacket daily in the Tetons throughout the transition from fall to winter and continued wearing it on active days in the mountains through winter and into spring. When worn over a baselayer, it offers the exact protection we need, even on cold and stormy days while backcountry skiing, nordic skiing, or snowshoeing.

Due to its perfect and flattering fit, it also works well under a down puffy or shell on particularly frigid days or the downhill portion of backcountry ski adventures. In more forgiving weather during the shoulder season, we throw it over a T-shirt for bike rides, trail runs, and hikes.

As an active layering piece, the Capa Hybrid does it all for a very reasonable price. We tested this jacket on adventures where temperatures ranged from the mid-teens to the mid-40s, and it’s the one layer we could keep on during wild temperature swings.

Its thoughtfully placed insulation and breathability mean less stopping to adjust layers or remove a jacket. Less stopping and messing with layers means more time for fun and more efficient movement throughout the mountains, which is a huge plus for us.

As for features, the folks at Cotopaxi nailed this one: they gave us everything we wanted and nothing we didn’t. The PFC-free DWR finish helps fight off dampness during flurries or light rain. The “scuba hood” hugs our noggin to keep warmth in and wind out, and works well over a baseball hat or under a ski or climbing helmet when needed.

Thumbholes and elastic at the hood, cuffs, and hem keep warmth in, and ensure a seamless barrier between us and the elements. It’s also extremely packable and lightweight. All these touches, coupled with an amazingly comfortable jacket that moves with us no matter what we’re doing, make this our favorite new jacket of the season.

We also feel good about wearing the Capa Hybrid Insulated Jacket thanks to Cotopaxi’s sustainability efforts. It’s made with recycled nylon, PrimaLoft Gold P.U.R.E. (Produced Using Reduced Emissions) Insulation, and Bluesign-approved fabric.

The only downside to this jacket, and we’re reaching here, is that it’s not completely windproof. The insulated chest panels block a light breeze, but you can feel wind permeating the soft sleeves and side panels.

If this jacket were windproof, it probably wouldn’t be as breathable and, therefore, wouldn’t perform as well during vigorous activity. However, if you’re looking for a warmer, windproof piece at a similar price point, look at the REI Co-op Stormhenge 850 jacket.

This inspired jacket, which fits perfectly, comes in fun color schemes, and can act as an outer or midlayer, is now our go-to for every adventure where we’ll be pushing it in the mountains. Its comfort, versatility, packability, and stylish look also make it ideal for traveling and around-town errands.

The North Face’s Casaval Hybrid Hoodie ($260) is a redesigned technical layer that’s perfect for your next mountain adventure. Summit Series apparel is specially designed to prove functional and formidable in extreme conditions, and the Casaval truly exceeds our expectations when put to the test.

The Ventrix insulation is extremely lightweight yet warm, and the stretchy fabric allows you the freedom to take on just about whatever the mountains throw at you. Whether you’re climbing in sendy temps or taking on a cold summit, the Casaval really does excel when you’re mobile.

The helmet-compatible hood is stretchy and snug without impeding peripheral vision, and the jacket is breathable enough not to heat up when the sun pierces the clouds.

Other than a lack of internal storage, we couldn’t really find anything bad to say about this jacket. We took it on several trips to Tuolumne Meadows in unseasonably cold temperatures and hiked, bouldered, sport climbed, and scrambled up a dome. Perhaps the only downside to the jacket is that it’s so nice we were afraid to get too close to the rock.

The Casaval not only excels in the wild, though. When hanging out in Mammoth Lakes, we received numerous compliments on the Cave Blue color scheme. The near-matte finish tones down the bold colorway, making the purple-leaning hue a daring win for The North Face’s men’s line. The style, functionality, versatility, and light weight made the Casaval Hybrid Hoodie an easy challenger to the Best Overall award.

It’s a bit heavier than our top pick, and while this may be subjective, the color and feel just don’t look quite as adventure-ready. It performed otherwise in our testing but didn’t quite outshine the Arc’teryx Atom jacket.

Perhaps this has to do with brand identity; The North Face trends toward more fashion-forward ventures while Arc’teryx to its formidable roots. Either way, you look at it, the Casaval is one of the best insulated jackets of the season.

Patagonia’s warmest synthetic jacket, the DAS Parka ($449), has been a staple with alpinists and outdoor enthusiasts for years. From freezing belays to snowy mountaintop ascents, it has kept adventurers warm and protected since its debut in 1992, with its newest model carrying on the torch, offering even greater warmth and packability.

“DAS” stands for “Dead Air Space,” referring to the way in which the jacket traps air in two different densities of PrimaLoft Gold Insulation (top-notch stuff), which has been fused with aerogel technology to boost softness and warmth. Its 133g insulation runs throughout the jacket, with an extra layer of 40g insulation placed along areas that require more warmth.

We immediately noticed and appreciated the DAS Parka’s stellar weather resistance in light precipitation and heavy winds. Its 10-denier Pertex Quantum Pro shell is treated with a polyurethane dry coating and a hefty DWR finish. It’s not a rain jacket by any means, but moisture beads up and runs off the jacket well, and you feel kind of invincible in wild gusts of wind.

Negatives? It’s quite heavy, at 19.6 ounces, and doesn’t pack as small as we would like into the large included stuff sack. One of our tester’s friends thought it was actually their sleeping bag while unpacking from a particular trip.

We also found the front pockets to be somewhat annoying. They are quite shallow and don’t extend to the bottom of the jacket like the internal dump pockets do. This could be for easier use while wearing a harness, but we thought it was harder than usual to warm our hands in them when the temps plummeted or store a bunch of stuff while on the go.

All in all, this is still one of the best synthetic insulated jackets you can buy for epics in the alpine or nippy winter temps around the campfire. It’s a legacy piece from a quality brand that just keeps delivering.

The Outdoor Research SuperStrand LT Hoody ($235) is a light, airy, adaptable jacket that effortlessly fits in your pack while providing down-like warmth and solid weather resistance.

We took this sleek performance hoody straight to the wild, putting it to the test in various conditions — from sunrise ski tours to mellow nordic adventures. It truly shines during active pursuits, providing the perfect amount of warmth during below-zero, fast-paced dawn patrols.

This lightweight layer is versatile enough to wear over a baselayer on dry days or under a shell to protect against the elements when the weather turns snowy and wet. During late summer and early fall mountain bike rides, it became our go-to for chilly descents, providing just the right amount of wind resistance.

The weight-to-warmth ratio is simply outstanding, and its ability to compress to the size of your hand makes it extra versatile. Plus, with two inside stuff pockets and two secure outside pockets, it’s designed to keep your essentials close at hand.

The Super Strand LT Hoody is undeniably a standout item; however, it’s not the most breathable synthetic jacket available, so you’ll want a piece like the Black Diamond First Light Stretch Hybrid for warmer days.

We were also disappointed with the zipper quality — after a few months of use, the teeth of the main zipper separated, rendering it unusable. We sent it in for repair, and Outdoor Research remedied the situation, but we hope they’ll improve the zipper quality moving forward.

This versatile hoody, with ample storage and an exceptional weight-to-warmth ratio, deserves a place in every outdoor adventurer’s collection. The protection it offers for its size is invaluable, and it can keep up with your high-energy adventures, no matter the season. Even if you don’t use it daily, having it in your gear kit is wise.

If you’re an outdoor enthusiast who values adventure and prioritizes safety, don’t hesitate to add the Outdoor Research SuperStrand LT Hoody to your arsenal. You’ll be amazed at how often you find yourself reaching for it year-round.

We adored our original First Light Stretch Hoodies at GearJunkie, so when we read that “the fit and overall design has been entirely overhauled for ’23” — we had some trepidation. Don’t fix what isn’t broken! Well, after a proper season of big wall battles in Yosemite, some alpine romps in the Cascades, and months of abuse at our local Chattanooga crag, our fears were put at ease. The First Light Stretch ($295) is back, and we’ll confidently say it’s better than ever.

This active midlayer has been a staple for backcountry alpine climbs, winter cragging, and blustery ski touring with its breathable four-season insulation and stretchy silhouette. Black Diamond describes this jacket as the ideal “start-stop” piece, providing warmth when you need it and airy breathability when you don’t.

This sounded just about perfect for Senior Editor Chris Carter, who wore this layer more than anything else on a recent fall ascent of El Cap. Whether huddling with his partner in frigid squalls at uncomfortable hanging belays or pulling hard on endless hand jams, the First Light kept him at a cozy homeostasis through all manner of chilly conditions and activity levels. He’s convinced this is the crème de la crème of active insulation comfort.

A few notable upgrades from this jacket’s previous iteration make it an even more potent tool for the active adventurer than before. Where once was silver, there now is gold — and PrimaLoft Gold Active insulation is hard to beat. It breathes efficiently and stretches with each movement but somehow traps an absurd amount of heat when static.

Body-mapped insulation along the body, shoulders, and arms packs more heat in targeted zones and allows greater breathability in areas that need it most.

The update also culls a few ounces from the last model, but seems to be a warmer layer than before. It also packs up small into a zippered hand pocket and easily clips to your harness. A cherished feature that is often eschewed on synthetic jackets.

While we were pleasantly surprised with this new design in most areas, a few cons did surface. Durability was a standout feature of prior models, but we noticed some premature pilling with this iteration, and a good number of picks and frays after just a handful of trips, and we’re scared a bit of tenacity was sacrificed when cutting weight.

Now granted, these trips included shoving our bodies up sharp granite chimneys, bushwhacking through briers, and taking a few spicy lead falls on rough slabs — so there’s a chance we’re being too critical. But, for a jacket that’s designed for technical mountain terrain, we would like to get several seasons out of it at least.

Also, if you’re looking for a jacket that offers the greatest weather/wind resistance, this isn’t the one for you. It insulates fine, but heavy gusts cut through it easier than others. Pair it with a light windbreaker, though, and it’s a power combo in heinous wind.

For start-stop activities where ventilation is needed while cranking hard, and warmth is required when static, the First Light Stretch Hoody is about as good as it gets. It won’t keep you as warm as others on this list but is a phenomenal technical layer for missions that have you constantly on the move.

Need even more breathability? Check out the similar First Light Hybrid (also reswizzled in 2023), which features breathable Merino insulation on the back panel and sleeves. While this won’t keep you near as warm, it boosts the A/C during those awkward shoulder-season temps where the weather just can’t make up its mind. And, the soft breathable back panel makes it a prime pick for backpacking.

An absolute classic, the Patagonia Nano Puff ($239) is probably the most recognizable synthetic jacket on the market. As one of the first jackets to offer premium synthetic insulation with a lightweight but durable design, it has a heritage unlike many in its category.

It features a stylish design that looks good around town, yet boasts surprising warmth and durability, making it a reliable layer for the backcountry. The versatility of this piece contributes to its reputation, and the newest model definitely stays true to its legacy.

The Nano Puff delivered middle-of-the-road results and proves to be a solid do-it-all jacket despite not being the lightest, warmest, or most breathable option out there. It has a pretty competitive warmth-to-weight ratio, though if you need a super warm puffy for winter pursuits, this isn’t the one for you.

This model performs well in shoulder-season adventures, or as part of your layering system for colder forays in the mountains. The PrimaLoft Gold Eco insulation used in the current model does deliver impressive warmth for how thin it feels and does a great job of retaining its insulating properties when wet.

The Nano Puff is somewhat breathable, given the amount of stitching it has, but the solid sheet lining limits airflow, and feels pretty clammy when sweat builds up. This reduces ventilation, but does help with wind resistance when temps start to drop. Its slim design and premium insulation make it one of the more compressible synthetic jackets out there, which is one of the areas it shines the most.

If you need maximum warmth for chilly adventures or lightweight breathability for fast and light missions, this probably isn’t the jacket you want. However, as a functional yet stylish crossover layer for use around town, or deep in the mountains, the Nano Puff remains one of the best synthetic insulated jackets out there.

The new Solution Hoody ($279) from Black Diamond is an excellent addition to any cold-weather adventurer’s closet. The Primaloft Gold Eco insulation is warm when you need it and breathable when you’re too lazy (or busy) to take it off in more moderate temperatures.

A protective hood performs well over a helmet, and the DWR treatment was confidence-inspiring when the weather looked like it could turn at any moment. The two zippered hand pockets are large enough for just about whatever you need to cram in for a long day, and the addition of a zippered chest pocket allows for easy access to items if you happen to be wearing a harness.

As former residents of the Pacific Northwest, we’ve always been big fans of Primaloft Gold insulation. It recovers well if the DWR treatment gets overwhelmed and soggy, and doesn’t get stinky when you stretch the time between washes. For that reason, the Solution Hoody is a great choice for long-distance ventures when it might get overused and then stuffed in a pack for a while.

At just 12.8 ounces, the Solution Hoody disappears inside a pack (although we wouldn’t recommend cramming it up in long-term storage). While it didn’t quite reach our superlatives list, it’s up there with all of the best insulated jackets available today.

Rab has done it again! Ticking all the boxes of a solid active insulator, the Xenair Alpine Light Jacket ($225) is breathable yet warm, and crazy comfortable, per Rab’s long-standing reputation. For start-stop activities in mixed conditions where stellar breathability is needed, but warmth is also a concern, this jacket stands out as a quality layer for the dedicated outdoor athlete.

The jacket has thoughtful features, but retains a sleek, stylish look. Raised zippered handwarmer pockets accommodate backpack hipbelts, and an internal zippered pocket doubles as a stuff sack. Soft elastic cuffs and a single hem adjustment help maintain warmth and reduce cold spots.

The hood is elasticated on the front and back, ensuring a snug fit, but did give us some issues when worn under a climbing helmet (as it isn’t quite big enough to fit over one). When wearing it under a helmet, the elastic banding, flat front brim, and slippery fabric caused the hood to often cover our eyes and obscure our vision when looking up or side to side.

One of the most notable features of the Xenair is its breathability. It regulates temperature and deals with moisture buildup with ease. Rab has thrown a good deal of cutting-edge technology into this jacket, including two densities of PrimaLoft Gold Active+ synthetic insulation, some of the warmest, most breathable insulation on the market, combined with a weather-resistant, permeable Pertex Quantum Air outer fabric.

This allows for maximum warmth, while greatly reducing moisture and vapor buildup. Additionally, two weights of insulation are strategically mapped around the body, with lighter, more breathable insulation placed on areas of the body, such as the underarm and center back, that require more ventilation.

For the active mountain athlete looking for a lightweight, breathable midlayer for colder climates, or a standalone outer jacket for summer pursuits, the Rab Xenair Alpine Light Jacket may just be the perfect option.

Read Review: Patagonia Micro Puff Hoody Review: First Look

Patagonia’s Micro Puff Hoodie ($329) has drawn accolades and awards from users and media since its release in September 2017. Though the price point is on the higher end, the Micro Puff Hoodie is the perfect just-in-case insulating layer that’s barely noticeable in the pack.

With just a base layer, the 10-ounce Micro Puff Hoodie kept us warm during moderate-level activities down into the 30s. It was surprisingly wind-resistant for such a light garment. Consequently, though, breathability is on the lower side.

The DWR treatment is exceptional and continues to bead water after a few wash cycles. The fit is snug, and the sleeves keep our wrists covered — except when our 34.5-inch arms are overhead.

A lack of stretch and the just-to-the-waist torso length allow a little gapping during long reaches. The jacket is very compact, and the slick outer surface makes it ideal for layering underneath shells or heavier layers.

Stuffing down to about the size of a cantaloupe, the Micro Puff Hoodie fits into a handwarmer pocket with a clipping point. This ability, combined with the best-in-class warmth-to-weight ratio of Patagonia’s PlumaFill, makes it a great insulator we are always throwing in our packs.

The Pertex Quantum GL face fabric proved durable during the test period but does require care, as the wispy fabric is prone to tearing on sharp objects. Compared to some of the others, this shell may not hold up well to brutal bushwhacking or scrambling over sharp rocks in the alpine.

However, the Micro Puff’s lightweight, wind-resistant versatility makes it ideal for adventurers who need reliable warmth without sacrificing space or weight in their packs. It’s one of the best synthetic insulated jackets out there.

The Rime Light IN Flex ($249) has a very snug fit when still, but class-leading elasticity allows free movement. The sleeves and lower hem are a tad short for overhead reaches, but the fit around the shoulders feels ample regardless of arm movements.

The Rime Flex is on the warmer and bulkier side of the active insulation category. The Pertex Quantum Air shell and OTI Stretch insulation provide breathability and warmth that works well for loaded hiking down to the upper 20s.

It keeps you warm during breaks, even in moderate winds. As long as the main zip was vented, the jacket performed well into the 30s. We found it excellent for lounging into the lower 50s.

The Rime Flex has two handwarmer pockets in the high position, an adjustable lower hem, dual-zipper pulls, and an insulated helmet-compatible hood.

For the space-conscious hiker focused on an ultralight setup, this may not be the best choice, but if you are looking for maximum warmth without sacrificing breathability, the Rime Flex is a solid pick.

If it’s going to be named after the Norse god of war, it had better be a stalwart layer. After a season of putting a number of Helly Hansen’s Odin collection through technical mountaineering trips, long multipitch climbs, and extended backpacking trips, we’d say these pieces truly live up to their name.

The Odin Stretch Hood Insulator 2.0 ($260) is one of the models we had the pleasure of testing, and for full-on backcountry missions in brutal conditions, it’s up there with the best of the best.

For a jacket specced out with so many pro features, it boasts a surprisingly approachable price point. Performance-oriented details like a flat-brimmed contoured hood, articulated elbows, wide elastic cuffs, and ventilated underarms make this a power player in the mountains, without the sticker shock of other high-end jackets.

Helly Hansen’s Odin collection was tested by Search and Rescue and mountain guides from around the world, and was built to handle demanding mountain terrain in the most gnarly conditions possible. These pieces are vetted and trusted by professionals on a global scale — and it shows.

The Stretch Hood Insulator is a bit warmer and thicker than Black Diamond’s First Light Stretch Hoody, our top pick for breathability, but still regulates temperature fine, and responds well when you pick up the pace.

The ventilated pits, permeable polyamide shell, and inherently breathable nature of PrimaLoft Gold Active+ join forces to keep you cozy in moderate activity, but appropriately warm when you slow down.

The fit is slightly athletic, without being too form-fitting to limit layering underneath. As a bulkier/warmer jacket than others on this list, we like to pair this with a thin fleece underneath, and a windbreaker, softshell, or hardshell overtop to form a truly formidable barrier against rain or heavy wind.

Our favorite feature? The silky smooth, stretchy lining fabric has the best next-to-skin comfort we’ve tested in a while. Though we usually have a base layer underneath, the almost fleece-like lining had us throwing this on over our T-shirts around camp, and even sleeping in it without a shirt on. It’s that cozy.

We wish the weight was a bit lower, that it had an over-the-helmet hood, and that it packed into one of its pockets for convenient transport on a harness, but aside from a few grumbles, this jacket is one of the very best synthetic pieces we tested.

It moves and breathes with you as you contort your body on desperate winter rock climbs or parkour over boulder-strewn river beds, but hunkers down and keeps you surprisingly warm when static. For the active mountain athlete needing a premium, mega-comfy insulating layer at a respectable price — look no further.

Here it is — the gold standard of lightweight warmth and what seems like every ultralight thru-hiker’s jacket of choice for their pilgrimage on long trails. The Torrid Jacket ($200) is a king in the world of synthetic insulation. Starting at just 6 ounces, most elements of the Torrid are customizable and can be altered to fit each person’s unique style and goal.

Who would have thought that down jackets would slowly be knocked off the backpacking pedestal by a synthetic piece from a small (though not so much anymore) company in Minnesota? Made with premium CLIMASHIELD APEX insulation, the jacket is almost see-through but somehow traps heat like a beast. No sewn-through seams eliminate cold spots, and a shock cord adjustment at the hem and elastic cuffs seal in warmth.

One of the authors of this guide wore a single Torrid for the duration of an 8-month thru-hike of the CDT and AT, and it retained its loft, warmth, and stitching the entire time. While it’s designed as a three-season layer, it was put through its paces in freezing whiteouts in the San Juans and winter squalls through the Smoky Mountains.

Often paired with a fleece midlayer or rain shell, it kept him plenty toasty. Since it’s synthetic, it also retained its warmth during weeks of dreary rain when nothing stayed dry.

Can there be cons to such a jacket? Well, the 8.2-ounce weight (7-denier outer and inner fabric with hood) of the Torrid we tested comes with a pretty steep cut in durability. You don’t want to battle off-trail with this thing. It also isn’t form-fitting at all (designed to be layered underneath), with a basic, boxy design. It’s not the stylish Arc’teryx jacket you love wearing around town.

Regardless, if you are looking to minimize base weight without sacrificing warmth for an epic journey across the country, or occasional fast and light forays in the woods, it’s one of the best synthetic insulated jackets you’ll find.

The GearJunkie team has been huddling together in shiver bivies, tugging on tiny granite crimps, and slogging along skin tracks in synthetic jackets for just about forever. When we say we’ve exhaustively sampled the market’s selection — we mean it.

We’ve tested these jackets in everything from the mountains of Alaska to the long trails of the Lower 48 to the domes of Yosemite. No stone was left unturned in the creation of this roundup, and each jacket had to pass a series of demanding tests to merit any real estate in this guide.

Editor-at-Large Seiji Ishii curated our initial selection of 11 jackets for this guide in January 2020. A prolific climber, hiker, and all-around outdoorsman, Seiji has spent many miles roughing it out in these synthetic puffy jackets and knows the importance of a solid jacket in the backcountry.

Author and Senior Editor Chris Carter took over this guide in August 2022, and has been combing through his closet, and scouring the internet ever since to bring you the most current, deserving selection possible. As an ultralight thru-hiker and endurance backpacker, the functionality-to-weight ratio of each item he carries on his back is of utmost importance, and every element of the gear he packs is considered.

Chris has thru-hiked the Triple Crown of long trails (the Appalachian Trail, Pacific Crest Trail, and Continental Divide Trail) and continues to pursue long-distance hiking around the world.

He’s tested a range of different synthetic jackets on these trails and has found synthetic insulation to be the best choice for versatility, breathability, and weather protection on long journeys. He knows what makes a synthetic jacket worth its mettle for different adventures and has been fastidiously choosy about what ends up in this guide.

In 2024, Ryan Kempfer and editor Chris Kassar took over testing and writing for this guide. They’re both skiers, climbers, hikers, and outdoor enthusiasts who prefer adventuring in the cold.

We know the competition for the synthetic podium is fierce and constantly evolving, which is why we’ve slotted this guide into a regular update schedule. As soon as fresh technology or new designs hit the market — we’re scoping them out, testing them in the wild, and deciding whether they deserve attention.

Rest assured, every jacket in this guide has been vetted by our stone-cold pros and has proven to be worthy. If you’re in the market for other layering options, check out our guides to the best down jackets, best windbreaker jackets, best fleece jackets, and the best midlayers. If you’re looking for an all-in-one layer for more static activities, check out our guide to the best winter jackets.

Synthetic insulation has become a popular alternative to down over the years, and the market now offers a wide range of high-quality synthetic-filled jackets. On this list, some of our recommendations highlight puffy jackets that prioritize warmth, while others are best used during high-output activities like running or skiing, where breathability is key.

Synthetic midlayers that focus on warmth stress thermal efficiency for lower-output activities such as walking, belaying, fishing, and so on. Puffy synthetic midlayer jackets prioritize maximum warmth over breathability.

On the other hand, active insulation jackets offer more breathability for high-output pursuits such as backcountry skiing, jogging, and climbing. Synthetic jackets designed for active use are more breathable and better at regulating temperature.

Beyond these two broad categories, there are many other factors to consider as you narrow down your synthetic jacket search. In this buyer’s guide, we aim to prepare you to make an informed and confident purchase.

Synthetic insulation is designed to replicate the qualities of down. It’s made from polyester fibers arranged into intertwined filaments that trap warm air in millions of tiny pockets.

Compared to down jackets, synthetic insulated jackets have both pros and cons. Importantly, synthetic insulation is able to retain its warmth when wet. This is a huge advantage over down and a key reason why synthetic insulation is often preferred in wet and cold environments.

Unfortunately, synthetic insulation cannot quite match the miraculous warmth-to-weight ratio of down. In other words, synthetic jackets need to be a little heavier to achieve the same level of warmth. However, there are some super-light options, including our top pick of the category, the Outdoor Research SuperStrand LT Hoody.

There are many different types of synthetic insulation on the market now, and various companies have their own proprietary types of insulation that they either fill their own jackets with or sell to other companies. A few of the most common types of insulation are PrimaLoft, Thinsulate, and PlumaFill.

PrimaLoft, one of the most widely used types of synthetic insulation, is made with 100% polyester microfiber that mimics the fluffiness of natural down, and comes in a few different categories. The most popular are PrimaLoft Gold, PrimaLoft Silver, and PrimaLoft Silver Eco (which is made of 70% recycled fibers).

PrimaLoft Gold is the most performative and sought-after insulation in their lineup, and is comparable to a 550-fill power down jacket. Each of the categories, to varying degrees, is highly breathable, water-resistant, and compressible.

Thinsulate insulation is considered to be one of the warmest thin apparel insulations on the market. Its incredibly thin fibers retain a surprising amount of warmth, and the nature of its tight construction makes it a prime material for ultralight insulating layers, or small clothing items such as gloves.

Though every type of synthetic material will lose at least some of its insulating properties when wet, Thinsulate boasts excellent moisture-wicking abilities, allowing it to dry quickly. Other types of fill, such as Polartec Alpha and FullRange insulation (used by Patagonia in the Nano-Air series of jackets), offer arguably the most breathable options out there.

Polartec Alpha, or Alpha Direct, was manufactured out of a military request to develop a synthetic and incredibly breathable alternative to down that could be used in high-intensity activities. The insulation eventually found its way into the outdoor industry and is used by many different brands today.

Take a few moments to envision how you’ll use your insulated jackets. Do you need something for winter climbing or long-distance backpacking? Or will this be a jacket that does it all? There’s no right or wrong answer. But being clear about your intended use will help you prioritize certain factors such as breathability and durability.

In each of the product reviews above, we have highlighted a variety of different features that the jackets are known for, in addition to ways they could be improved. Take a look at both the pros and cons of the layers, and focus on what activity you will be using it for most.

If you are setting out on a 5-month thru-hike of the Pacific Crest Trail, you will need an insulated jacket that keeps you protected and warm in a vast range of ecosystems and climates.

If you want a layer that keeps you cozy while belaying at the crag or walking the dog downtown, you may not want the most feature-packed, versatile shell on the market.

Each of the jackets above is either a regular synthetic jacket or an active insulation jacket, and the main difference between the two types is breathability. Generally, there’s a tradeoff between breathability and waterproofness. Fully waterproof jackets are less breathable than active-use softshell options.

If you’ll regularly wear your jacket as an outer layer, it’s worth investing in a bit more waterproofing. But if you’ll use it mainly for high-output activities, look for a jacket that maximizes breathability.

In general, synthetic insulation is more breathable than down since it doesn’t trap the body’s heat as effectively as down does. The level of breathability of a jacket varies, though, and has to do with the type of insulation it uses, along with its shell material and design.

Jackets such as the Black Diamond First Light Stretch Hoody and the Cotopaxi Capa Hybrid Insulated Hooded Jacket maximize breathability due to the nature and construction of the insulation used, as well as the strategic placement of breathable material used in the shell.

Using your synthetic jacket as an element of your layering system, you can weather most conditions with even a more ventilated model. Pairing a breathable jacket with a burly rain jacket or hardshell when Thor’s hammer strikes gives you a power combo of thermal efficiency.

If it’s all at once, something like the REI Stormhenge will keep you warm and dry. If it’s just burly wind you’re worried about, throw a thin windbreaker jacket over your insulator for an ultralight, ultra-mobile barrier against the elements.

Durability is particularly important if you plan to wear your jacket as an outer layer in rough and rugged environments. Most jackets on this list stand up great to the rigors of bushwacking or climbing on rough rock. But some need a bit more care than others.

The durability of synthetic insulation versus down insulation is somewhat of a debated topic, as there are a number of factors to consider. Synthetic insulation doesn’t have to be babied as much as down insulation, but also loses its form and breaks down faster over time, especially if you are compressing the jacket a lot. Down tends to leak from the jacket more, however, and therefore slowly loses its warmth.

Not all synthetic insulation is created equal, though, and the different types of insulation will vary in how long they hold up to harsh conditions. When thinking about the durability of a jacket, the type and quality of the insulation (such as PrimaLoft Gold versus PrimaLoft Silver) and the construction of the outer shell (such as what denier and material is used) need to be taken into consideration.

Additionally, it’s important to remember that often, the more durable a jacket is, the heavier it is. So, if an ultralight setup is your main concern, you may need to go with a more fragile layer.

A shell like the Patagonia DAS Parka offers increased durability but may weigh your pack down too much for quick missions in the mountains. If you want to thrash about without concern, something like the thinner Patagonia Micro Puff Hoodie may not be the best choice but could lend itself as the optimum layer if light and fast is your main goal.

Where synthetic insulation really trumps down is in its ability to insulate when wet. Down absorbs water, and clumps up, thereby losing its loft, as opposed to synthetic insulation which retains its loft. Water sits between the fibers, allowing the insulation to keep its shape, maintain warmth, and dry faster than down.

While all synthetics will generally repel moisture better than down, the degree to which a jacket will insulate you in damp conditions varies from brand to brand. Most manufacturers are adding a DWR (Durable Water Repellant) treatment to the outer shell of their insulated jackets, which beads up water in light precipitation, allowing it to roll off and not soak into the insulation.

We really appreciated this feature in our top lightweight pick, the Outdoor Research SuperStrand LT Hoody and our budget pick, the Cotopaxi Capa Hybrid Insulated Hooded Jacket. However, this only works to a certain degree, and in constant rain, you’ll want to add a rain jacket to your layering system.

Sure, you plan to wear the jacket, not just pack it around. But for those times you need to ditch a layer or bring it just in case, pack size and weight matter. Synthetic insulation doesn’t tend to pack as small as down (although synthetic fill technology is rapidly improving).

While the Patagonia Micro Puff may not be the most durable jacket, it wins big on the packable scale. The Outdoor Research SuperStrand LT Hoody and TNF’s Casaval Hybrid Hoodie are other easy-to-pack choices.

Depending on your intended use and general needs, you’ll want to choose a jacket with the right array of features.

Pockets, hoods, adjustable hems, and elastic cuffs are all examples of common synthetic jacket features. Each of these has a unique purpose and value.

Pockets come in a wide range of sizes and shapes. From zippered hand-warmer pockets to low-profile chest pockets, the recommended jackets on this list offer a wide range of configurations.

Many synthetic jackets are available in either a hooded or non-hooded style. The best choice for you depends on your use. Hooded jackets are great in frigid or stormy conditions and for people who tend to feel cold in the ears, head, and face. Unhooded options are generally best for everyday use around town or in-bounds resort skiing.

At the end of the day, you want to get a good deal. More than just the lowest price tag, a jacket’s value stems from its usefulness. Carefully consider how you’ll use your jacket and then look for features that fit your needs. Helmet-compatible hoods, pockets, and materials become important considerations. Also, if you plan to wear your jacket regularly, it’s worth investing more. Spending a few extra bucks now will afford you many seasons of warmth and comfort outdoors.

Budget picks hover in the $150-200 range. The inexpensive jackets will get you around town and perform well on light adventures but may not have the same mobility, breathability, and performance as pricier models.

Fortunately, our top budget pick, the Cotopaxi Capa Hybrid Insulated Hooded Jacket ($180), is one of our favorite jackets. It’s our go-to for vigorous adventures in a wide range of temperatures, and it doesn’t sacrifice mobility, warmth, or performance despite its super-approachable price tag. The same goes for the Outdoor Research SuperStrand LT Hoody, an ultralight option that outperforms many on this list.

Most of the synthetic jackets on this list fall in the $250-300 range. Jackets like Black Diamond’s Solution Hoody ($279) and Arc’teryx’s Atom Hoody ($300) will stand up to loads of abuse and help regulate temperature while keeping pack weight down on truly technical backcountry missions.

For the fashion-forward who want technical performance in a stylish option they can wear around town, then The North Face Casaval Hybrid Hoodie from this list is an ideal choice. Our best value winner, the REI Co-op Stormhenge 850 ($279), is a beast of a jacket that is warm, water and windproof, and durable for an affordable price.

While it’s almost as warm as Patagonia’s DAS Parka and Arc’teryx Atom Heavyweight Hoody, the Stormhenge is not as technical and does not boast as many features or durability as these premium options.

Synthetic jackets that come in above $300 may deliver more durability or warmth, but not always. The Patagonia DAS Parka ($449) and the Arc’teryx Atom Heavyweight Hoody ($350) are the heaviest and warmest jackets on this list.

The Patagonia Micro Puff Hoodie ($329) is not nearly as warm as any of the above-mentioned jackets. However, it is extremely lightweight, packable, and wind-resistant, all features that often contribute to price.

Consider the full range of conditions you plan to encounter on your trip and choose a jacket that will hold up to whatever you plan on putting it through.

Synthetic jackets are used in all sorts of situations where comfortable and reliable warmth is needed. From the ski hill to the jogging path, synthetic jackets are a modern and effective tool in the fight to stay warm.

Compared to down jackets, synthetic jackets tend to be slightly heavier and less vulnerable to moisture-related warmth loss. Elite mountaineers use synthetic jackets, as do city dwellers on their way to buy groceries.

On this list, we’ve divided our recommended jackets into two unique categories. For maximum warmth, check out our synthetic insulated jacket category. If you’re looking for a jacket that can regulate your temperature and breathe during active use, check out our active insulation category.

Compared to down, synthetic insulation is slightly heavier, slightly cheaper, and less likely to lose its effectiveness in a rainstorm. Unlike down, synthetic insulation is able to retain its warmth when wet.

When dry, however, synthetic insulation cannot quite match the miraculous warmth-to-weight ratio of down. In other words, synthetic jackets need to be a little heavier to achieve the same level of warmth.

Many skiers wear synthetic insulated jackets as a midlayer beneath their waterproof outer shells. On cold days at the resort, a warm and puffy jacket can be the difference between comfort and misery.

For backcountry skiing, breathable layers are the way to go. During uphill hikes along the skin track, you’ll want layers that can let some of your body heat escape in order to stay cool and prevent sweating.

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