Reviews You Can Rely On

Best Long Underwear for Men of 2021

We put men's long underwear to head to head tests from brands like Smartwool, Outdoor Research, Ortovox, and others to find the best and warmest options
When you find the right pair of bottoms you can't help but leap, leap ...
Photo: Jo Savage Photography
Thursday November 4, 2021
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Our Editors independently research, test, and rate the best products. We only make money if you purchase a product through our links, and we never accept free products from manufacturers. Learn more

Need new long underwear bottoms? After researching more than 30 of the best models on the market, we settled on 9 pairs to test side-by-side. Our team of experts spent months, in every season, taking these layers on river trips, ski slopes, cold winter trail runs, long multi-pitch climbs, and multi-day backpacking trips. We sought out different climates to determine which pairs are best for warmer seasons and which are best to wear through the coldest depths of winter. We backed up our field research with objective, laboratory-style tests designed to analyze specific features. We offer this comprehensive, unbiased review to help pair you with your next pair of long johns.

Related: Best Long Underwear for Women of 2021

Top 9 Product Ratings

Displaying 1 - 5 of 9
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Awards Editors' Choice Award Top Pick Award Top Pick Award   
Price $110 List
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$66.71 at Backcountry
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$69.00 at REI
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Overall Score Sort Icon
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Pros Soft next-to-skin, super warm for its weight, durable and all-naturalA nice balance of warmth and breathability, super cozy, nicely articulated designBreathable, highly efficient wicking, comfortable merino/recycled polyester blend, impressively durable100% recycled polyester, light fabric weight, impressive loft and warmthWarm, super versatile, durable, include a pocket
Cons A touch heavy for fabric weight, slow to dry after washingExpensive, stretches out in between washes, slow to dry when saturatedNot designed for mid-winter warmth, relatively heavy for fabric weight, thin waist bandQuestionable durability, saggy bottomExpensive, awkward fit, below-average breathability
Bottom Line Undeniably comfortable, warm, and breathable, this rough-and-tumble pair of 100% merino long underwear has it allDesigned to keep you warm in the coldest conditions, this is a versatile pair of merino wool bottomsA versatile, lightweight merino-recycled polyester blend that offers superb breathability and wicking, making these a near ideal high performance bottom for any fast-paced adventureWarmer than most, lighter than the rest, this pair of long underwear re-defines what is possible from a synthetic base layerBuilt for cold conditions and with durability as a primary consideration, these cozy bottoms are great for everything from winter trail running to cold resort skiing
Rating Categories Ortovox 185 Rock'N'... SmartWool Merino 25... Outdoor Research Al... Patagonia Capilene... Arc'teryx Rho LT Bo...
Warmth (30%)
8.0
9.0
6.0
7.0
8.0
Breathability (30%)
7.0
6.0
9.0
8.0
5.0
Comfort And Fit (30%)
8.0
7.0
7.0
7.0
7.0
Durability (10%)
7.0
7.0
7.0
5.0
9.0
Specs Ortovox 185 Rock'N'... SmartWool Merino 25... Outdoor Research Al... Patagonia Capilene... Arc'teryx Rho LT Bo...
Material 100% Merino wool 100% Merino wool 47% Merino wool / 47% Recycled polyester / 6% Spandex 100% Recycled polyester with HeiQ Fresh 84% Polyester / 16% Elastane
Fabric Weight 185 g/m² 250 g/m² 150 g/m² 147 g/m² 190 g/m²
Weight (size M) 6.4 oz 8.3 oz 6.8 oz 5.88 oz 6.8 oz
Insulation Weight Midweight Midweight Lightweight Lightweight Midweight
3/4 Boot-Cut Available? Yes Yes No No No
Fly? No Yes Yes Yes No
Dryer safe? No No No Yes No


Best Overall Long Underwear


Ortovox 185 Rock'N'Wool Pant


76
OVERALL
SCORE
  • Warmth 8
  • Breathability 7
  • Comfort and Fit 8
  • Durability 7
Materials: 100% merino wool | Weight: 6.4 oz (size Medium)
Warm for weight
Durability
Soft waistband
Attention to details of fit
Heavier than fabric weight suggests
Slow to dry
Merino wool is not dryer-friendly

After months of testing, the Ortovox 185 Rock'N'Wool Pant has risen through the ranks to land on top of the pile of best long underwear bottoms. These bottoms hit that Goldilocks zone of base layer weight — not too light, but not too heavy. They offer the type of fit and comfort that will have you wearing them long after the day's activity comes to an end. The 100% merino wool knit is nearly unmatched in terms of next-to-skin comfort. Most notably, the wide waistband is thoughtfully sewn on the outside of the pant, eliminating any chance of that annoying itch that often develops after these all-natural layers inevitably stretch out.

The weight-to-warmth ratio of these bottoms is fantastic — featuring a level of warmth that far exceeds their fabric weight — but this does come at some expense of breathability. Slide this pair of long underwear on before a long day of ski-touring, and know that the merino wool will efficiently wick away any sweat on the way up, keeping you dry, comfortable, and warm standing on the summit, but that it will not be as breathable as a lighter-weight pair. The wool knit is uncharacteristically durable, but like all 100% merino layers, these are no doubt more prone to snags and tears than a full synthetic layer. The 185 Rock'N'Wool Pant is an investment for sure, but with proper care, these will likely provide years of winter-time adventure.

Read review: Ortovox 185 Rock'N'Wool Pant

Best Bang for the Buck


REI Co-op Lightweight Bottoms


63
OVERALL
SCORE
  • Warmth 5
  • Breathability 8
  • Comfort and Fit 6
  • Durability 6
Materials: 92% Polyester / 8% Spandex | Weight: 5.5 oz (size Medium)
Lightweight
Quick drying and very breathable
Wallet-friendly
Legs are a touch short
Not very warm

Setting the standard for a simple, no-nonsense pair of long underwear, the REI Co-op Lightweight Bottoms are everything you need to help extend your playtime into the colder months. Offering quality performance at a price point much lower than most models in this review, these bottoms continue to define value in this category. The lightweight polyester knit features a bit of spandex for a little extra stretch, adding mobility to these form-fitting bottoms. As a lightweight option dappled with small vents, this highly breathable layer easily doubles as a pair of cool-season running leggings.

These bottoms have a shorter inseam, but REI offers a longer option that may better suit taller folks. And while we wished the full-synthetic build offered a bit more durability, our abrasion test far exceeds most real-world applications. We don't suggest it, but even if you were to ruin these bottoms dragging them up sandstone towers on your next desert climbing escapade, at least you didn't drop a huge wad of cash on them. Great for chilly nights on late summer camping trips and your more aerobic winter activities, this versatile pair of johns satisfies a lot of needs for little cash.

Read review: REI Co-op Lightweight Bottoms

Best for Warmth


SmartWool Merino 250 Bottoms


73
OVERALL
SCORE
  • Warmth 9
  • Breathability 6
  • Comfort and Fit 7
  • Durability 7
Materials: 100% merino wool | Weight: 8.3 oz (size Medium)
Cozy and comfortable
Terrific thermoregulation
Merino wool-lined waistband
Stretches out between washings
Expensive

It should not come as much surprise that we also love the Smartwool Merino 250 Bottoms. The combined warmth and comfort of this pair earn our nod when the temps really dip. The special interlock knit of this design provides exceptional breathability, especially considering the thick, 250 g/m² cut of the 100% merino wool. Updates include rear gussets to match the front, improving upon issues we've had with the fit in the past. The extra-wide, wool-lined waistband and full-flatlock seam support cut down on any common complaints of itchiness. While these are designed specifically for cold conditions, their balance of warmth and breathability makes them versatile even when temperatures begin to warm up a bit.

Regardless of the thick construction of this pair of bottoms—and indeed, it is one of the most durable all-natural layers we tested—all merino layers require a level of care that goes above and beyond most articles of clothing. The Merino 250 bottoms tend to stretch out through regular use between washings, but don't be tempted to throw them in the dryer to shrink them back up. Careful laundering, and mainly flat or line air-drying, will help improve the longevity of this and all merino base layers. While laundering may be an annoyance, the superb thermoregulation capability makes this pair of long underwear well-worth the extra effort, especially for those working or playing in really cold conditions.

Read review: Smartwool Merino 250 Bottoms

Best Lightweight Pair


Outdoor Research Alpine Onset Bottoms


73
OVERALL
SCORE
  • Warmth 6
  • Breathability 9
  • Comfort and Fit 7
  • Durability 7
Materials: 47% Merino wool / 47% Recycled polyester / 6% Spandex | Weight: 6.8 oz (size Medium)
Efficient moisture wicking
Super comfortable next-to-skin
Approachable fit
Only warm on-the-go
Slim waist band

Revived and revamped, the Outdoor Research Alpine Onset Merino Bottoms are back by popular demand, and we are on board. These lightweight bottoms were a previous award-winner, and this updated version only improves on the long underwear’s legacy of outstanding performance. A masterful blend of merino wool for exceptional moisture-wicking, recycled polyester for quick-drying, and elastane jersey for superior next-to-skin comfort, the Alpine Onset once again became a go-to for fast-and-light adventure. A versatile pair of bottoms that are as ideally suited for uphill skiing as they are for 3-season backpacking trips, this pair of long underwear focuses on breathability while still offering just the right touch of warmth.

Even though these lightweight bottoms are designed for chilly, early-morning alpine starts, they are not warm enough for hanging around on a snowy belay ledge or ice fishing. This may be a bit of an obvious criticism based on their fabric weight, but we want to make it plain that these are far from the warmest bottoms in this review. Although these bottoms don’t fit offer quite the same uber-athletic, glove-like fit as the previous model, the updated fit will likely appeal to a wider range of consumers — even though the waistband could be widened for additional comfort. For any activity that is going to work up a sweat, the Alpine Onset is our choice for a lightweight pair of long underwear.

Read review: Outdoor Research Alpine Onset Bottoms

Compare Products

select up to 5 products to compare
Score Product Price Our Take
76
$110
Editors' Choice Award
These bottoms offer top-quality performance in every category, and they’re super cozy to boot
73
$100
Top Pick Award
An extra-warm pair of bottoms that knows how to properly thermoregulate through the coldest temperatures
73
$89
Top Pick Award
A lightweight, merino-recycled polyester blended pair of bottoms that are perfect for fast-and-light adventures
71
$69
A light-feeling layer that offers midweight warmth, without sacrificing breathability or comfort
69
$89
Built for cold conditions and with durability as a primary consideration, these cozy bottoms are great for everything from winter trail running to cold resort skiing
67
$85
A pair of bottoms that boast great warmth for how thin the merino is and breathe like a champion
66
$95
Exceptionally standard, these full-merino bottoms offer up high-quality performance in a no-frills package
63
$40
Best Buy Award
A simple, workhorse pair of bottoms that offer a solid level of performance for an unbeatable price
61
$25
These baggy bottoms provide an extra kick of warmth over other lightweight models we tested

Field testing the Smartwool Merino 250 bottoms.
Field testing the Smartwool Merino 250 bottoms.
Photo: Roland Mott

Why You Should Trust Us


Our expert on cold weather-layering systems is Aaron Rice. Pursuing snowy adventure as a way of life, Aaron works as a ski patroller, avalanche educator, and snow scientist — ask him about stellar dendrites or the finer aspects of back-door cold fronts, and he'll gladly talk your ear off. In his free time, you might chance across him in the seldom-traveled high mountains of New Mexico, exploring while out trail running, backpacking, alpine climbing, and ski touring. Outdoor educator and guide Roland Mott also contributed to this review, bringing the experience and attention to detail that only comes from a life avidly spent engaged in a variety of outdoor activities (often spent wearing long underwear). Roland earned a degree in Outdoor Recreation Leadership in 2010 and has guided rivers, backpacking, and climbing for 12 years throughout the US and Central America. Also, as a Master Educator for the Leave No Trace Center for Outdoor Ethics, Roland has taught land stewardship and environmental ethics courses.

Click to enlarge
Click to enlarge
Click to enlarge

To effectively analyze a great pair of long under bottoms, we identify four key metrics: Warmth, Breathability, Comfort and Fit, and Durability. Our experts then develop a series of tests to help judge each model in factors like warmth and breathability in the field, and other more targeted laboratory tests to judge fit and durability features. From the alpine peaks of the Rocky Mountains and the Pacific Northwest, back down to the high deserts of the US Southwest, we put these bottoms to the test through a variety of activities. We wear these bottoms climbing, trail running and backpacking, and uphill and downhill skiing, and continually assess and re-analyze their relative strengths and weaknesses throughout our adventures.

Related: How We Tested Long Underwears

Analysis and Test Results


Long underwear (also commonly referred to as base layer bottoms) plays an important role in keeping you warm and regulating your body temperature while you're out playing in colder conditions. Base layer bottoms often only get pulled out when the cold of winter sets in, but even if they aren't used as frequently as tops, they can still be quite versatile. You can pack them as pajamas on a backpacking trip, have them pull double-duty as cold weather running tights, or just layer them under your favorite pair of jeans for a night around a bonfire. Obviously, for cold-weather activities like ice climbing and skiing, these are more of a necessity. But regardless of the situation, these bottoms work to keep you dry and comfortable by wicking sweat away from your body, improving thermoregulation, and ultimately improving your outdoor experiences.

Related: Buying Advice for Long Underwears

These scores are based on a variety of tests. We design both the field and laboratory testing to be both comprehensive and mutually exclusive. We determine scores for each metric, compile those numbers and assign a total score for each pair. It is important to note that the assigned scores are determined relative to the other products in the review. We specifically test only the best layers on the market, so a low score does not mean that a product is not worth its weight-in-wool. It simply means that it does not perform as well as other products when compared side-by-side. By testing and rating each of these layers relative to one another, we're able to highlight specifics to inform your next purchase.


Value


Though it may come as a surprise, some of these bottoms are expensive. If you're a mountaineer, go on multi-day ski tours, love winter camping, or just spend a lot of time recreating in cold conditions, investing in a high-end, performance base layer is easier to justify. However, if you're looking for a pair to pull on to shovel the sidewalk, you likely have some more wiggle room and can still get your hands on a decent quality product for a lower cost. Merino wool models, in general, are going to cost more because the material is more expensive to produce. However, you help offset external costs by opting for an all-natural product. Synthetic models are almost always less expensive and often carry quick-drying capacity, which can be very important when the weather begins to warm up. Despite the environmental costs of production, synthetics tend to be more durable than merino, lasting through many wash cycles so that their longevity adds to their value.

For those who often find themselves waking up before dawn to climb a...
For those who often find themselves waking up before dawn to climb a mountain, the investment in a high-quality pair of long underwear is worth its weight in gold for your comfort and safety.
Photo: Jill Rice

The REI Co-op Lightweight Bottoms may not provide the right amount of warmth for long adventures in snowy conditions, but they're versatile enough to both walk the dog on cold winter days and to pack as a lightweight extra layer on a backpacking trip. For the sustainably-minded, the Patagonia Capilene Midweight Bottoms are a synthetic option made from 100% recycled polyester. In terms of balancing price and warmth, the Smartwool Merino 150 Bottoms are the most reasonably priced 100% merino wool option in our review.

Some bottoms spell it out for you, like these Capilene Midweights, a...
Some bottoms spell it out for you, like these Capilene Midweights, a base layer that is clearly designed for "cool to cold" conditions -- most times we're not so lucky with up-front information on the tag.
Photo: Jill Rice

Warmth


Warmth is one of the most significant factors to consider when shopping for long underwear. A layer's ability to keep you warm is rooted in its ability to wick sweat away from your body, keeping you dry and comfortable while active. So while we often notice a correlation between warmth and thickness of a material, we also have to take into account the type of fabric and fit.


Base layer bottoms are versatile, but warmth is a dynamic metric because we don't all run at the same temperature. When considering a pair of bottoms, first consider how you plan to use them. We've worn these layers while working up a sweat skinning steep terrain, walking the dog in freezing temperatures, fall backpacking, and sleeping in the back of the truck or out in a tent through the long, dark, cold nights. Do you want versatility across all four seasons or just mid-winter warmth? Are you layering them under a single, technical hardshell pair of climbing pants, or rather under a thick pair of ski pants that already offer a level of warmth and insulation? It is important to be aware of the fact that the warmest bottoms aren't always the most practical.

Finding the good stuff and testing warmth in a bitter cold snowstorm...
Finding the good stuff and testing warmth in a bitter cold snowstorm in the Rockies
Photo: Kricket Servis

If you need bottoms for activities in the bitter cold, we recommend the Smartwool Merino 250, Ortovox 185 Rock'N'Wool, or Arc'teryx Rho LT, based on overall warmth. If you're looking for a more versatile pair of long underwear, the Smartwool Merino 150, Patagonia Capilene Midweight, and Icebreaker Merino 200 Oasis bottoms are midweight options that tend to blend the seasons. If warmth isn't as pressing for you, a lightweight option like the REI Co-op Lightweight or Carhartt Base Force bottoms may be the ticket for summer backpacking, cross-country skiing, or winter climbing trips to the desert. Similarly, if you're looking for a lightweight layer for your SkiMo training, the Outdoor Research Alpine Onset bottoms rely upon moisture-wicking capability more than warmth by insulation alone.

A good pair of long underwear will keep you warm enough while...
A good pair of long underwear will keep you warm enough while cooking so that you don't have to huddle around the campfire.
Photo: Aaron RIce

Breathability


Breathability is a quality that can make or break how effective a base layer is when it comes to regulating your body temperature. A garment's ability to breathe lives in the fibers of the fabric. Breathability is the fiber's capacity to move heat-induced moisture (i.e., sweat) from the inside of the garment to the outside, allowing it to then evaporate from the surface of the layer. This process keeps you from overheating and allows the bottoms o continuously dry out when you're working up a sweat. Improved breathability keeps you from becoming a soggy mess, ultimately keeping you warmer in cold temperatures.


Our body temperature doesn't fluctuate as intensely on our bottom half as it does on our top half. But it does house some of our major working muscles and thus is an area that is good at producing consistent heat. Having a pair of long underwear that will dump heat and stay dry is important when you're participating in highly aerobic, start/stop activities, like backcountry skiing. The most breathable layers we tested, not so shockingly, are on the lighter side in terms of fabric weight.

There&#039;s snow somewhere around here, I just know it! Putting...
There's snow somewhere around here, I just know it! Putting breathability to the test on a much too warm and dry day to be hiking in ski bottoms.
Photo: Kricket Servis

Almost every merino wool layer we tested offers superior moisture-wicking ability. This is a natural quality of merino wool, allowing these layers to breathe well while you're on the move. If you are seeking a high level of breathability from full-merino pair of long underwear, the Smartwool Merino 150 and Icebreaker Merino 200 Oasis bottoms are great choices. While all-natural fibers dominate in terms of wicking ability, synthetics tend to dry faster on the body. The Patagonia Capilene Midweight and REI Lightweight bottoms are both full synthetics that do a solid job of wicking away moisture. But the front-runner in our testing was the Outdoor Research Alpine Onset bottoms, a hybrid of recycled polyester, merino wool, and elastane jersey, which combines the best of each fabric to provide top-notch breathability.

Synthetic material has the benefit of easy design over all-natural...
Synthetic material has the benefit of easy design over all-natural fibers, allowing features like ventilation pockets to be sewn into the material. Here, we have the REI Lightweight bottoms on the left, and Patagonia Capilene Midweight bottoms on the right -- two very different designs, offering a similar level of breathability.
Photo: Aaron Rice

Comfort & Fit


Comfort is a metric that is reasonably uniform across different users — we all want to wrap our legs in plush, soft-spun wool, or silk-like polyester. But the fit is very much a subjective matter, as the perfect fit understandably varies just as much as we vary in body type. Through analysis of articulation, seam placement, cut, and design features, we do our best to identify any areas of concern that may apply to every user, not just the ones that match our bodies. But with that being said, we always suggest trying clothing on in-person so that you can decide for yourself if they fit well.


We consider several factors to determine comfort and fit:
  • Feel of the fabric next to skin
  • How tight or loose they fit in particular zones, such as the knees and cuffs
  • The stretch of fabric and freedom of mobility
  • Width and comfort of the waistband
  • Length of the legs and fit of the cuffs
  • Depth of the crotch, factoring in any bottom-sag
  • The type of seam stitch, articulation, and the associated comfort of type of stitch used
  • The layering ability of these bottoms

Despite an awkward fit, the Arc&#039;teryx Rho LT bottoms are the only...
Despite an awkward fit, the Arc'teryx Rho LT bottoms are the only pair we tested that features a pocket, making them a versatile pair for cold-weather running.
Photo: Jill Rice

We only test high-quality products here, so comfort is fairly uniform. Particularly comfortable are any of the 100% merino bottoms, and ones made with recycled polyester, like the Patagonia Capilene Midweight. So when it comes to ranking pairs of long underwear side-by-side, it is the fit that sets them apart. If you are looking for that ultra-soft pair, perfect for getting after it as well as the down-day hang, check out the Smartwool Merino 250 and Arc'teryx Rho LT bottoms. Ones that are still going to feel like your favorite pair of sweatpants, just with a little more cut, are the Ortovox 185 Rock'N'Wool or Smartwool 150 bottoms. Finally, if you're looking to fit in with the yoga or fall-running crowds, consider the Icebreaker Merino 200 Oasis.

The 100% merino wool of Ortovox 185 Rock&#039;N&#039;Wool bottoms actually...
The 100% merino wool of Ortovox 185 Rock'N'Wool bottoms actually soften with use, making the whole kit an instant favorite for any sort of trip, and particularly as camping jammies.
Photo: Jill Rice

Durability


Durability has never been a particularly strong suit for base layers — remember, these bottoms are specifically designed to be worn at the base of your kit. When these layers can pull double-duty as a pair of running tights, we like to think of it as more of a bonus than a requirement.


Merino wool has been historically susceptible to rips, tears, and punctures, but brands have been making serious strides in recent years to enhance the durability of this all-natural fiber. For example, Smartwool uses a process that wraps the merino wool around a nylon core to increase durability, which makes the Merino 150 and 250 bottoms particularly durable.

Washing and drying in a machine is the quickest path to destruction for long underwear, particularly for fully merino wool garments. A tip for washing merino layers: if you wash them in a mesh bag, it significantly reduces the wear they experience through bouncing around during wash cycles. Additionally, as with most wool layers, we fully endorse the manufacturer's suggestion of laying the long underwear flat to dry.


Other designers opt to blend polyester fibers with merino wool to increase product life, like the Outdoor Research Alpine Onset bottoms. While synthetic fibers are traditionally more durable, the thinner lightweight bottoms are the most susceptible to damage, regardless of fabric material. However, the Carhartt Base Force Lightweight bottoms break this generalization, easily standing up to our overly aggressive abrasion test.

An exploratory mission to the Wind Rivers will put bottoms to the...
An exploratory mission to the Wind Rivers will put bottoms to the test, from freezing mornings and steep snow approaches to long days on the rock under sun.
Photo: Roland Mott

While all-natural options are improving, still the most durable pair of long underwear we tested are a pair of synthetic bottoms. Thanks to a brushed-nylon face fabric, the Arc'teryx Rho LT showed very little wear after both laboratory and extensive field testing. Of the merino wool layers, the thick fabric of the Smartwool Merino 250 is the most durable, and the slightly thinner Ortovox 185 Rock'N'Wool pants proves itself worthy with similar durability results.

Durability is key for pair of long underwear to last on multi-day...
Durability is key for pair of long underwear to last on multi-day trips.
Photo: Jill Rice

Conclusion


For work and play, long underwear bottoms are a great way to extend your seasons and help keep you outside through the coldest months of the year. To land on your next perfect pair, it is important to consider your temperature disposition, as well as how and when you plan to use them. From all-day ski tours to desert backpacking trips, to shoveling the driveway and hanging on the couch, these versatile bottoms are sure to keep you warm and dry no matter the activity or occasion.

Grab a versatile pair of long underwear bottoms, like the...
Grab a versatile pair of long underwear bottoms, like the award-winning Outdoor Research Alpine Onset bottoms, and set out for your next adventure!
Photo: Jill Rice

Roland Mott and Aaron Rice

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