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Stay warm and comfortable this winter with our selection of the best winter underwear. Designed for optimal insulation and moisture-wicking properties, these essentials keep you cozy during cold weather activities. Featuring soft, breathable fabrics and a snug fit, our winter underwear ensures you stay dry and comfortable all day long. Whether layering for outdoor adventures or lounging at home, these versatile pieces provide the perfect foundation for any winter outfit. Embrace the chill with confidence and style, knowing you’re equipped with the best winter underwear available.
$30.00
performance fit pants brushed interior fabric offers all- day comfort and warmth body contouring design for great shape tag- free design provides a fuss- free
$130.00
slim fit is intended to follow the contours of the body crewneck long sleeves engineered construction uses knit structures to enhance performance with lighter weights and cleaner finish 3d mapping results in near custom fit and freedom of movement while ribbed elbows provide added
$67.97
WAS: $90.00*
Bought a month ago and will use all winter! ... It has a fleece like lining and should keep you warm this winter season. ... . feels good next to the skin ... This will be a great base layer for cold weather and great outer layer when the temps are cool or
5
mwo131313
If you need a high- performance base layer for extreme cold, the UA Base 4. 0 ¼ Zip is one of the best options out there. Just bought my second one.
5
M2024
Great base layer, warm and comfortable
5
Jasonwithg
Good quality nice and warm
5
JKT91
amazingly, surprisingly warm.
5
Lawrence45
Purchased a Large. The fit& feel is nice. Only issue is it maybe a little too tight in forearms( if you like to roll- up your sleeves).
$44.97
WAS: $100.00*
These were perfect for a early winter trip to CO! ... Love them, extreme warmth, so much warmer than base 3, I like the looser fit in the legging ... These are amazing to keep me
5
Mand4
Comfortable and warm, like that they are black and can be worn as a base layer or outer layer
5
Mom2025
Got this for my daughter, she is a teacher. Keeps her warm through her sedentary day. We 've tried other products with little success. The 4. 0 is perfect.
5
GT1976
The Under Armour base layer are the best thermals on the market!
5
mob1032
These leggings are very warm and great for watching football games in the winter.
5
Kristy w
The best cold weather gear I have gotten yet!
$54.99
Perfect for layering under pants when working all day outside. ... Great fitting, warm layer option ... My husband said he liked them, they are quite heavy, heavier than we thought, but are very happy with the
5
MDV43
Comfortable. They fit full length. I am 6' 3. They did n't shrink when washed and they are just overall pretty awesome for thermals.
5
NancyG
These thermals fit well and keep me nice and toasty when I 'm outside.
5
Ppinner
I bought this product as Christmas present for my husband
5
MarcosD
These are baggier than most thermals but work great.
5
Jack sprat
Recent purchase, worn a few times. So much better than my old pair of thermals.
$115.00
slim fit 100% merino wool fabric made with an interlock knit for enhanced comfort, breathability, thermoregulation, and odor resistance fit updated to improve functionality while enhancing aesthetics merino- covered elastic interior waistband and traditional fly design flatlock seam construction...
5
Kwhendy
Bought these about a week ago and wear them nearly every day. I love how they keep me warm but do n't make me hot.
5
Mountain time
Fit great especially in length. Perfect weight to stay warm in cold weather.
5
tjflan2
Fit true and worked outstanding as base layer for football game. Very comfortable and breathable.
$39.99
WAS: $44.99*
outside layer: 70% polyester/ 30% merino wool ... pruf® technical fiber polyester with silvadur™ intelligent freshness ... inside layer: 100% cold ... rib cuffs drop tail for added protection against cold regular
$65.00-$130.00
WAS: $130.00*
Love it, it is light but warm I wear them all winter long ... Love this base layer pant to compliment the top. ... They 're very comfortable and keep me warm enough to enjoy the slopes for
5
abeck
[ I received these as a Christmas gift. I love them under my bibs for snowboarding! They ’ re tight but flexible and comfortable. They keep me warm on the mountain.
5
shellydk
[ I could go on and on about this whole line from Smartwool. It's their best thing in a very long time and I 've been a fan for years. The material is very soft, has a great but comfortable fit. These bottoms also have a nice wide and sturdy waste band so there is no bunching or other uncomfortable nonsense in that area. These are very warm, so perfect under a shell pant or bib for alpine skiing, but I do n't think I would wear them on a tour.
5
Hmae
[ Love the style. These are very warm and keep me toasty on those cold days. Would recommend to anyone looking for a quality under layers... very cute!
See Price in Cart
WAS: $115.00*
add one of our best base layers for cold weather to your winter wardrobe and experience the difference the next time you go skiing, hiking, climbing, or
5
Mele
[ I bought this for a gift for my daughter who works outside in Oregon winters with the horses. She loves it- Warm and cozy and fits like a glove! great base layer! Smart wool has been my go to for years!
$19.99
Nothing feels better than wearing long underwear during these long, cold, New Hampshire winters. ... Kept me warm on a 3 hour winter hike! ... Best$ 20. 00 I
5
jman151
I bought this for a snowboarding trip in Colorado. Excellent product. Kept me warm in the mountain.
5
IslanderAC
Fits true to size. Does the job in maybe 50- 60⁰ weather to keep your legs warm.
5
Ebaker187
Kept me warm on a 3 hour winter hike! It was about 25- 30 degrees out too.
5
Michael 7
I bought these to wear on those cold days on the golf course. Excellent purchase. Works as designed.
5
AkScott
I took the Duofold pants with me on a three week visit to a cool place. I went out on hour and a half to two hour hikes in temps from 30 to 45 degrees. My legs stayed warm even on rainy days.
$39.99-$41.99
silvadur™ intelligent freshness controls odors and bacteria growth, and the flat seams ensure irritation- free wear. ... the brushed interior offers next- to- skin warmth and the single layer engineering ensures quick- drying
5
Figarohall
I bought these to wear under my jeans to an Eagles game and I was soooo warm.
$36.00
quad- blend fabric technology allows heat retention to keep you warm ... relaxed fit pants ultra- soft brushed interior offers all- day comfort and warmth true comfort stretch for ease of movement non- deforming design helps hold the shape tag- free design provides a fuss- free
$35.00
Best product ever ... Best underwear ever! ... Overall, the best pair of outdoor- rated underwear I have ever worn! ... The best fit and material. ... Best underwear ... I ’ ve tried just about every brand of wool...
5
S
[ Very comfortable and light weight. Ordered my usual size
5
Beth
[ Great fit and VERY fast drying. Great for everyday, sports and travel
5
Stephanie
[ Yes!! These are wonderful! We traveled 16 days in Italy with 3 pair of underwear! They were so easy to wash out and always were dry in the morning!
5
Hawkeye
[ Moves with your body. I do n't even notice it is there. Best Underwear Ever.
5
MTB Chick
[ These are the best underwear! I struggle to find underwear that do n't ride up. These stay in place!
See Price in Cart
WAS: $115.00*
add one of smartwool's best base layers for cold weather to your winter wardrobe and experience the difference the next time you go skiing, hiking, climbing, or
$44.99
I bought these so I may continue playing golf in the colder weather. ... Keep Warm ... Wore these under snow pants in- 10 weather for ice fishing and they worked
5
ThomasL
This base layer has been great in cold weather. They perform well enough that I do n't notice I am wearing them while working.
5
JamesY
They fit great and keep me nice and warm working outside in the wind all day.
5
Lando523
Wore these under snow pants in- 10 weather for ice fishing and they worked awesome. Definitely buying them again in the future!
5
Tanner2
These base layer bottoms are great for cold weather. Carhartt products never disappoint.
5
GolfmanNJK
I bought these so I may continue playing golf in the colder weather. I ’ m pleased with the results.
$130.00
Best base layer I own! ... super comfy and a perfect base layer ... The color is also gorgeous and definitely keeps warm! ... Soft and warm ... Very warm and soft not remotely itchy like most
5
Chris
[ Bought the set for my girlfriend and she absolutely loves it. Fits great and would highly recommend.
5
K Nicholson
I purchased this top( and the leggings together as a set). Altogether, it is one of the better base layer fits I ’ ve had the chance to try out in the elements. Overall the top is probably my favorite piece, not only because of the high quality materials used- but because of the sleeve length. As a tall/lanky girly, some genuine long sleeves are always greatly appreciated. The style is also a great plus, the outfit goes with pretty well everything( purchased in black for this reason). The outfit looks great together, but they can also be interchanged with other pieces and they still look awesome all while keeping you warm:)
5
Molly
I bought the fay mid weight base layer top and bottoms and they ’ re perfect. They ’ re so flattering and cute on their own and keep me so warm
5
Natalie
Fit is perfect, it ’s super comfortable- no tugging or readjusting needed throughout the day. Warm without overheating. And it goes so well with my navy ski gear from Halfdays. I always get compliments on the slopes!
5
edmistja
I wear this for outdoor exercise, as an everyday mockneck, and even as a pajama top. Well performing and well constructed. Love the color too.
$44.99
these tights give you the range of motion and warmth you need when battling the cold months. ... a comfortable essential done the carhartt way. ... dry® technology to wick sweat and dry fast built to move with rugged flex® stretch technology fights odors smooth flatlock seams, y- split waistband,...
$115.00
The best. ... My son loves wearing thermal bottoms for skiing. ... Solid base layer ... Keep me warm in the mornings as I 'm putting gear on, stays cool as I skin up the
5
Wesley on the Rocks
[ I highly recommend these for all of your snow adventures. I wear mine directly under my snow pants and they work perfectly for warmth and movement. This base layer helped me survive snowboarding in both Colorado and Canada. Buy a pair, its worth every penny!
5
Jordan
[ I ’ ve worn this pair of wool pants as a base layer a couple of times in the snow and stayed warm. They fit and feel great! I definitely recommend!
5
Joe1
[ Bought two pairs of these for a snow trip. Great feel and regulated temp perfect. Alternated the pairs and neither smelled after solid week+ of use.
5
Littlemisstexas
[ Purchased this for someone. They gave a thumbs up. I personally own a pair of women ’s smart wool. Money well spent. They last a long time, and they ’ re as comfortable as it gets.
5
Chris K
[ I bought this base layer bottom for a ski trip to Colorado. This did a great job keeping me warm in the cold mornings and wicking sweat away in the warmer afternoons.
$115.00
slim fit 100% merino wool fabric made with an interlock knit for enhanced comfort, breathability, thermoregulation, and odor resistance fit updated to improve functionality while enhancing aesthetics for a range of body shapes back body seam wraps to front for body- enhancing fit crew neck with...
5
BGRD
[ This shirt is incredible. I wear them daily during the winter time so I wanted multiple. Smart wool shirts are warm and not itchy at all! I wear them hiking as well as under dressy tops to stay warm in the office.
5
reddread
[ I waited forever to get this on sale and now I wished I 'd bought several in different colors! Warm but breathable, and stylish enough to layer with a jacket for a business casual look. I ca n't wait to take this baby out to the slopes!
5
Beez
[ SmartWool is our go- to for liners. It's well fit, cozy, soft and super warm. It does n't itch and make you warm yet is great to wear inside and on mild days out. Got this one for my wife.
5
klili
[ I got this a couple weeks ago and it's been perfect, it's of course a great base layer, but for days when too many layers are n't needed it is perfect as a long sleeve T- shirt. Hoping to get a couple more to round out the winter layers
5
Springtime44
[ I love smartwool products! This is my second of this specific shirt! My first one was a medium, which is perfect for layering, very form fitting. So I purchased a second in a different color in a large to wear everyday!
$115.00
My legs will not be cold this winter. ... Best base layers ever ... They are soft and warm and a great addition to my wardrobe. ... Cozy and warm pants ... When I sleep the wool helps me keep warm but not
5
Mrsfry
[ I recently wore them under my jeans in Sweden and it was the perfect combo. I stayed the perfect temperature inside and outdoors while walking around in December. I would highly recommend.
5
Kpave
[ These fit so great! I ’ m plus sized and sometimes sizing can be wonky or vague but these are a dream. They are warm for sure but I can ’ t wait until The temperature dips to really put tgem to the test.
5
Maw maw Z
My legs will not be cold this winter. They are of good quality and very soft and warm.
4
Rmrst40
These base layers are awesome! Super comfortable and warm under snow gear or by themselves! If the price point wasn ’ t quite so steep I would live in these all winter long!
$130.00
insulation, articulation and ventilation are seamlessly integrated to amplify movement and comfort during high- intensity activities ... slim fit merino sport yarn combines the power of merino with the durability and fast dry times of polyester seamlessly knit mesh ventilation designed to keep you...
$61.97-$115.00
WAS: $115.00*
Fit is perfect; extremely comfortable; keep me so warm in the winter! ... Amazing for skiing, alpine or backcountry ... Very comfortable and warm! ... Can wear all day
5
posie
[ Very impressed by Smartwool after hearing from a friend. this baselayer is super lightweight and warm. good for running as it is or layering under a waterproof pair of pants for frigid weather to hike
5
Sdwvt
[ I now own two pairs of these bottoms. I sized up to a medium. I wear them under my snowboard shell pants. I stay warm and they do not bunch. They are versatile. I can wear them around the house and out for walks. I love them.
5
Toasty
[ Driving around all day when it ’s cold out delivering mail and packages to the door, they help keep me warm and moving along. Oh come on, thanks for everything.
5
Lydn
[ The perfect merino base layer and lounging bottoms. Not itchy at all but soft, comfortable and stretchy. I 'm 5' 1, 108 lbs and the S fits well, not skin tight.
5
Prp74
[ I bought this wear at night during a backpacking trip. Worked perfectly when the temperature dipped to 30. More comfortable than the smart wool 150 baselayer.
$41.00
these kids' long underwear pants are knitted with mtf soft spun polyester fibers that transport moisture away from the skin to keep you warm, dry and
$85.00
slim fit light weight merino jersey fabric uses a nylon core to increase durability while still keeping 100% merino wool next to skin fully functional fly merino- lined, 1. 5 ”( 4 cm) wide elastic waistband designed for maximum comfort flatlock seam construction designed to minimize chafing fit...
$24.99
these base layer pants are designed with a cotton/poly blend and two- layer engineering to keep you comfortable and provide warmth when you need it
$24.99
Keeps you warm ... He wears them every day and they keep him warm. ... I love them they are thin not heavy for laying a must buy brand if you want thicker and warmer thermal get the same brand in expedition version military fleeced
5
Lynn2025
I bought these for my son. He wears them every day and they keep him warm.
5
YOYO90
I love them they are thin not heavy for laying a must buy brand if you want thicker and warmer thermal get the same brand in expedition version military fleeced ok.
5
skiellen
Bought these for skiing to go under ski pants and worked well. Less expensive than most but did the trick. They do run large however. Large was huge!!! We ended up with a small for my son.
5
Socker mom1
Great product at a good price. We need to buy the shirt.
5
Tacomama
I bought these for my husband& he is very happy with the purchase
$29.99
Thermal bottoms keeping me warm ... This is the first time I 've purchased or worn these pants and I like how they feel. ... Wonderful fitting thermal bottoms arrived just in time for the
5
aggielre2000
Love these, kept me appropriately warm on the slopes
5
Seabass76
This is the first time I 've purchased or worn these pants and I like how they feel.
5
SteveJ19
Wonderful fitting thermal bottoms arrived just in time for the snow. Free shipping and three- day turnaround were pluses.
$77.97
WAS: $130.00*
Again, very well made and warm. ... Inside and outdoors, it's a great layer to be wearing. ... I no longer have to wear multiple layers underneath a uniform to stay
5
Peter
[ The Smartwool Men ’s Intraknit Thermal Merino Base Layer performs as described. In addition, it is not at all itchy, yet warm and comfortable.
5
Pflan
[ Comfort, comfort, comfort and warmth. Fit perfectly. Nice and snug Now that I have a pair I won ’ t ever go without. Buying additional colors now.
5
Kimmer13
[ The base layers I bought were too thick so I sent them back and ordered another set. They notified me immediately my return had been received and the refund quickly followed. Great prices!
5
SeanT
[ Perfect fit and super soft! But these as a base layer and will be what I wear going forward. I also have two Smartwool tops that are amazing!
4
Zeejet
[ An excellent product with a compromise between the benefits/draw- back of PE and merino fabrics. My main criticism is the extremely high- cut waist that rides all the way up to the belly button. It should be about two inches shorter than it currently is. Fit( Men's Medium): Great in the legs but unusually high waist band. I 'm 5' 9 '', 165lb, 31 '' Waist, Climber's Build. Pros:+ Excellent wicking and drying times+ Warm+ Quality build Cons:- Unusual cut and fit at the waist- While already very soft to the touch, just a tad coarse compared to Icebreakers products.
$125.00
relaxed fit made with four way stretch for unlimited movement moisture transfer fibers move moisture away from skin to keep you dry upf 30 protection clima- wool fabrics boast superb breathability and temperature regulation for a comfortable
$110.00
These pants are very flattering with the high waist and are comfortable and warm. ... Great base layer for pairing with ski boots. ... These have a great amount of stretch and cute colors, keep me
5
Jacketquestion
[ I was skeptical after reading reviews but I really like these tights. The waist is high and seamless and very comfortable. Also doesn ’ t dig in creating muffin top stretchy and warm. Looks great under skirts for winter. Totally recommend. Feels lighter than the coordinating tops. True to size.
5
JLKNH
[ Good fit, snug but very moveable, slightly more so than Intraknit 200, although both are awesome. Pair with waterproof( maybe) lightly lined pant for full winter warmth without the bulk. Love the fun pattern to make life more interesting. Highly recommend!
$130.00
merino sport yarn combines the power of merino with the durability and fast dry times of polyester mesh ventilation seamlessly knit in gender- specific zones designed to keep the body dry and
$60.00
Very cozy and comfy. ... Perfect for outdoor school, or pjs. ... Comfy and the blue color is beautiful ... Kids love how soft and warm these are. ... My two kids( ages 11 and 8) love these and wear them both as pajamas and as base
5
Cindy
[ I bought this for my 6 yr old to wear for her first ski trip to wear under her bib. Worked perfectly! Not too thin and not too thick. She did n't even complain about it being itchy.
$140.00
free of plastic microfibers and petrochemical- based synthetics, this product is made with 100% pure merino fibers that were hand- picked for strength and softness to create a luxurious fabric that naturally breathes and resists
$120.00
slim fit top contour the body heavy base layer top and best base layers for cold weather made with interlock knit for enhanced comfort offset shoulder and side seams to increase comfort and minimize chafing side seams wrap to front for body- enhancing fit temperature regulated:...
$41.97
WAS: $65.00*
Otherwise- the best so far for warmth, fit, comfort, and length. ... Tried more than a dozen, these are the best ... The Best ... I ’ ve been using them to stay cozy while social distancing outdoors, but also while snowboarding and they ’ ve been...
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