â
Stay warm in the harshest conditions with our selection of the best extreme cold thermals. Designed for maximum insulation and comfort, these thermals feature moisture-wicking fabrics that keep you dry while trapping heat. With a snug fit that layers easily under your outerwear, you can enjoy outdoor activities without the chill. Ideal for skiing, hiking, or any winter adventure, our thermals provide the perfect balance of warmth and breathability. Gear up for extreme cold and embrace the outdoors with confidence.
$14.97
WAS: $44.99*
two- layer thermal for warmth in extremely cold weather flatlock seams to avoid irritation drawcord for custom fit ... The Champion Duofold Men's Varitherm Expedition long johns are the
5
Jordan2121
Fits comfortably and can move well in them. Perfect for any activity.
5
ToastyWarm
The Champion Duofold Men's Varitherm Expedition long johns are the best! A little pricey compared to some others, but you get what you pay for. I love the thickness, double layered. They keep my family warm during Winter sports. These `` Expedition '' pants are enough to wear under your snow pants... no need for another layer of sweatpants, etc. This brand, style is the ONLY one I have purchased since I became aware of them... I believe that's been over two decades! Now, I 'm buying them for my grandchildren!
5
Bengi
Really comfortable and warm better than any others that I ’ ve worn
5
powerstroker57
Bought this for a Spartan race out in the cold rain and kept me warm! Highly recommend! Super comfortable too!
5
Mr B
Great product**
$74.97
WAS: $100.00*
fit fitted leggings inseam: 29 1/2 ” technology ua base™ 4. 0 locks in your body ’s heat to deliver extreme warmth even in the brutal cold moisture transport system wicks sweat and dries quickly ua scent control prevents the growth of odor causing microbes to keep...
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!
$74.97
WAS: $100.00*
fit fitted long sleeve baselayer technology ua base™ 4. 0 locks in your body ’s heat to deliver extreme warmth even in the brutal cold moisture transport system wicks sweat and dries quickly ua scent control prevents the growth of odor causing microbes to keep you...
5
Fits like a glove, great material, true sizing.
5
SK719
Keep me warm while doing ice rescue training
5
DannyRK
South Carolina experienced extreme cold weather this winter, but while wearing my 4. 0 crewneck, the cold weather did not phase me not one bit. I see why the athletes opt for this gear during cold weather games.
5
JohnG111
Absolutely amazing- wore on single digit weather and only my hands and feet were cold
5
Dh2207
I bought these for my boyfriend who is an avid hunter and Lineman, he loves them! They keep him warm without getting sweaty!
$36.00
quad- blend fabric technology allows heat retention to keep you warm ... relaxed fit long sleeve shirt 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 wear...
$100.00
machine wash ... knit™- engineered body mapped technology? to regulate your body temperature and? let your skin breathe during high- intensity activity cool- lite™- a lightweight and breathable fabric blend raglan sleeve construction for mobility gusseted underarms for mobility and comfort thumb...
5
Mark
[ I am getting synthetic products out of my wardrobe and I have become addicted to Icebreaker long sleeve layering shirts. They are extremely comfortable, come in a variety of nice colors and weights, so are quickly replaced my synthetic top layers.
5
The Greek
[ This is one of two or three of the most amazing clothes I have. Technically it's a base layer but it's something I wear almost anywhere with the right pants and shoes. It's wool, but it's incredibly soft and comfortable. It works great as a base layer, but it's versatile.
5
Fredrick
[ This color is perfect, very beautiful and should be used again and again. Ideal light weight garment for fitness. Very breathable.
$36.00
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
$19.99
As someone whose feet are always cold, all year, all seasons, these socks are a godsend! ... These are the best socks that I have found for keeping my feet warm and the inner lining is very soft and
5
Scott F.
Lightweight and warm but even knee high to wear with boots, the socks get pulled down. This is did n't care for. The thicker socks stay up to the knee better.
5
James B.
[ These socks are warm and very soft. That is just what my toes need.
5
Jane T.
I love all your socks so much! As someone whose feet are always cold, all year, all seasons, these socks are a godsend! They are so comfortable! I am telling all my friends about them.
5
KRISTINA B.
Husband loves these better than any socks ever. He even wear a pair to bed every night this winter since he got them. We bought 10 more pairs.
5
Russ O.
Very soft& very warm. I was worried that they would make my shoes and boots too tight. But the thick fabric compresses and forms a well insulated sock.
$65.00
regular fit baselayer crew constructed with 4- way stretch material that moves better in every direction ua ’s warmest baselayer yet, delivering extreme warmth in the extreme cold soft, brushed grid interior traps air, managing your body's microclimate to keep you...
5
SkiBear33
4. 0 is the best base layer for the price. My kids are competitive skiers in the Northeast. Our winters are harsh and with windchill the temperatures can drop below zero. Using these 4. 0 as base layers helps to keep their heat from escaping. They hold up well through washing and the boys playing/lounging in them after skiing too. They both have two sets, and I only replace once they are outgrown. I just wish they came in more colors.
5
John Meincke
Spend money and buy the best performing stuff you can. And this is it. product was true to size. Kids were the other day and were plenty warm.
5
James CG
This shirt was absolutely perfect for our son ’s outdoor soccer. He was warm and comfortable for the outdoor session. We have already ordered more!
5
New Soccer mom
() Excellent base layer for outdoor sports. Light and Not heavy but warm enough for those chilly days and nights to keep your little player nice and warm, even when out in the field. Perfect for winter sports like hockey or soccer. I ’ m going to be purchasing more of these base layers!
4
Jessica1000
Purchased for winter soccer practices for a small 12 year old. Material feels to be good quality. It is really thick. The armpit area felt tight so we will be returning and purchasing the next size up.
$65.00
regular fit baselayer leggings constructed with 4- way stretch material that moves better in every direction ua ’s warmest baselayer yet, delivering extreme warmth in the extreme cold soft, brushed grid interior traps air, managing your body's microclimate to keep...
5
Britt829
These are amazing! We love them. ❤️ My dad got my husband and I both a set for Christmas like 10 years ago or more. They are still in perfect condition. We use them for hunting, playing in the snow or anytime we have to be outside for long periods of time in the cold. When I go hunting and it's super cold or wind chill of- 15. I wear mine, my husband's and my under armour sweat pants under my hunting bibs. No need for a heater at all. My son told me he needed some bigger under layers so I automatically ordered him this set. He is going to be so excited when he gets the Christmas morning. If you have multiple children you definitely need to get these. They are such a good quality and will last for years if they are taken care of. The adults sizes are pretty unisex in the bottoms. The woman's top seems to be a little more fitted for the breast.
5
John Meincke
By far the best and warmest product you can buy. The sizing accurate. Spend the money and buy this instead of the cheaper, knock offs that do not perform as well.
5
Zay63
These are great! They keep me warm in the coldest weather. I ’ m always cold so these are a blessing for me because they keep me warm and they are not bulky. They wash up great.
$74.97
WAS: $100.00*
fit fitted leggings inseam: 30 1/2 ” technology ua base™ 4. 0 locks in your body ’s heat to deliver extreme warmth even in the brutal cold moisture transport system wicks sweat and dries quickly ua scent control prevents the growth of odor causing microbes to keep...
5
Jeff1540
If you play cold weather golf you really need to get the UA Cold Gear product. I like it because it ’s flexible and fairly warm.
5
Prof13
My Under Armour- UA Base 4. 0 XL fits perfectly. The waiste band is comfortable. The fabric is a great barrier to the damp cold air near Lake Michigan as I watch my son ’s Zion Benton High School ’s Varsity baseball games.
5
MattB13
Very warm. Different than the old waffle style. But they still work just the same.
5
Amazing pair of pants
I work outside. And theses pants are amazing.
5
Great material. Fits like a glove. Perfect for cold weather. True to size.
$85.97-$115.00
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!
$115.00
Best base layers ever ... My legs will not be cold this winter. ... I have been waiting for these for my entire life and I ca n't wait to go through this next ski season with a pair of base layer pants that actually fit me so I do n't have to worry about being...
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!
$85.97-$115.00
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
See Price in Cart
WAS: $120.00*
as one of our heaviest base layer tops and best base layers for cold weather, this garment uses 100% responsibly sourced merino wool, shoulder panels, and a flatlock seam construction to help minimize chafing as well as help keep you comfortable and temperature-...
$19.99
Best$ 20. 00 I spent. ... Duofold Thermals Are The Best! ... Nothing feels better than wearing long underwear during these long, cold, New Hampshire winters. ... these two- layer thermal bottoms provide warmth in cold conditions...
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.
$85.97-$115.00
WAS: $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.
$34.99
pruf® men ’s expedition long sleeve crew is ideal for keeping warm in extreme cold. ... Excellent cold weather protection ... a good base layer is always important;
5
Michael 8
Bought this as a base layer. However, it's a very warm and roomy pull over that could be worn as a main layer.
5
Firelion
I bought this baselayer to use for my recent snowboarding trip. The weather was windy and 8 degrees each day. I already owned the baselayer pants which were military issued. This top was perfect. It kept me warm for 3 days. All I used was the baselayer and a hoodie with my ski shell over the top. Perfect setup all day long.
5
Mike2380
Nice warm shirt. Not too thick. Very comfortable!!!
5
MercManSniper2A
LOVE❤️Love these things don ’ t sweat keeps me warm and dry makes me wan na cry reach for the sky
5
LabDad
I have used ColdPruf gear for about 3 years. Living in the northeast it gets cold. These products can not be beat. I highly recommend them to everyone.
$89.97-$120.00
WAS: $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...
$105.00
regular fit comfort active stretch seam construction seams set away from shoulder for added support zip through collar with interior wind flap for ultimate warmth moisture transfer fibers to wick away moisture from your skin thumbholes in sleeves to help keep sleeves in place 4- way stretch for...
$34.99
pruf® men ’s expedition pant is ideal for keeping warm in extreme cold. ... comfort waistband rib cuffs for added protection against cold tagless and flat seams for added comfort full cut true fit comes in extended
5
Happy and I know it
5
Outdoor manly
Bought these on a whim to try out for working in the cold weather. I use them as a base Layer. They are very warm and very reasonably priced!
$92.00
machine washable ... active fit micro- elite chamois gussets under arms and at cuffs for a closer fit zip through collar with interior wind flap for ultimate warmth moisture transfer fibers move moisture away from skin to keep you dry upf 40 protection extended cuffs with thumb holes zip pocket on...
5
Snowhound1701
[ If you ’ re even thinking of going up to the mountains to ski or snowboard for a few days you better have all the layers for any conditions. Unless you want to freeze or be sipping hot cocoa in the lodge while your crew are a ripping it up. There is no equal when it comes to this base layer. Warmth and comfort all day. This is the Cadillac. Wouldn ’ t think of leaving without out this top.
$41.00
pepper bi- ply is a tried- and- true favorite choice for soft, comfy children's thermal pants while protecting against the cold. ... these children's thermal pants are made with two layers of fabric connected back to back with open spaces between...
$92.00
relaxed fit four way stretch for unlimited movement activated carbon enhances thermal regulation and odor blocking properties upf 30 protection moisture transfer fibers move moisture away from skin to keep you dry soft hand feel makes it easy to layer
See Price in Cart
WAS: $155.00*
this bulk- free, 100% merino wool thermal layer brings a new dimension to active winter wear ... insulation, articulation, and ventilation are seamlessly integrated to help with movement and comfort during high- intensity
$100.97
WAS: $135.00*
slim fit to follow contours of the body made with merino sport yarn: combines durability and fast dry times of polyester seamlessly knit mesh ventilation designed to keep you dry and comfortable 3d mapping provides maximum mobility merino wool helps with moisture management, temperature control and...
$96.97-$130.00
WAS: $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
$19.99
thick, chunky and with a massive tog rating of 2. 34 heat holders® are made from a specially developed heavy bulk yarn which has extreme thermal qualities long- pile cushioning advanced thermal yarn more than 7x warmer than a basic cotton
$19.99
The best cozy socks ever ... These were purchased as a gift- for someone who is “ always cold ”- I have several pairs and they are my favorite go- to socks during the cold months in the
5
Brian B.
[ Got these as a Christmas gift for my wife. She absolutely loves them! She says they 're cozy, warm, and perfect. They fit her feet well; she's a 9. 5 women's size and do n't fit too tight. Colors are vibrant and last in the wash. They 're top quality and seem like they 'll last a long time.
5
Jenna G.
[ I had a pair for years and just bought a couple new ones. There aren ’ t any other ones like them and they ACTUALLY keep so warm. Highly recommend.
5
Nancy T.
[ I received a pair of these socks for a Christmas present. I liked them so much I bought 2 more pair. My place runs cold and these keep my feet nice and warm!
5
Tracey R.
[ I love all of the heat holder products. I own multi different items.
5
Louise C.
[ Very nice at- home sock and/or cute with mules and leggings.
$97.97
WAS: $130.00*
They are amazing, my legs are never cold. ... 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.
See Price in Cart
WAS: $120.00*
merino sport yarn provides durability and fast dry times of polyester ... slim fit to follow contours of the body 3d mapping results in near custom fit and movement freedom seamlessly knit mesh ventilation designed to keep you dry and comfortable size medium inseam: 21. 5
$19.99
Best socks for the money ... keep feet warm on the coldest of days and pull on this pair of jacob twist color, crew length heat holders° for men, the warmest thermal
5
Dick L.
These socks have exceeded my expectations! They keep my feet warm!
5
Richard B.
[ Been wearing Heat Holders for years. Best socks for the money
5
Maureen B.
[ I have a larger four than women ’s socks evidently. I bought men ’s and they are great!
5
jennifer S.
[ Fantastic socks, non binding, warm& comfy. I buy them for family at Christmas and everyone loves them
$81.97
WAS: $110.00*
slim fit intended to follow contours of the body merino wool fabric made with interlock knit for enhanced comfort, breathability, thermoregulation and odor resistance offset shoulder and side seams designed to increase comfort and minimize chafing side seams wrap to front for body- enhancing fit...
$19.99
heat holders® are made from a specially developed heavy bulk yarn which has extreme thermal qualities medium- pile cushioning extra- long length advanced thermal yarn more than 5x warmer than a basic cotton
5
Gary H.
[ These lite socks are somewhat warmer than the ultra lite. They also come up slightly higher which is nice. Of course they are so soft. Being slightly thicker than the ultra lite they are a pretty snug fit in my shoes. I really like the higher socks as they help keep the warmth even higher up. Great products and great company to do business with!
5
Jane T.
Love these socks and all the other types I 've bought. My feet are always toasty warm, dry, and comfortable.
5
Debbie F.
Dry satisfied with product, repeat customer, given as gifts to many and always request more. Wry satisfied
5
Jay V.
I recently sustained a fractured ankle and my long lite socks, with the blessing of my doctor, where just the thing to help decrease the swelling.
5
Barbara R.
I feel like I just keep repeating myself in these reviews but Have never been disappointed so far! Socks( all) are cozy, warm& comfy. If you want to baby your feet, these are the socks to do it!
$19.99
keep feet warm on the coldest of days and pull on this pair of rivington twist color, cuffed, slipper style, ankle length heat holders® for women, the warmest thermal
5
Kathleen B.
[ My husband and I each wear these almost daily at home. They are warm, cozy, non- slip and well made. We safely navigate stairs, area rugs, etc. with them. We have purchased others for family.
5
Steve D.
[ I gave my wife hers right after Christmas. She was wearing them last night so I asked her how she felt about them. She loves them and can ’ t wait for me to buy more…
5
Jeanette E.
[ Love Heat Holders, the thick, soft socks keep your feet warm, and the blanket is so soft, comfortable, and keeps you warm too!
5
george w.
[ Warmest sock you can find anywhere, we live in the snow& have tried em all, happy wife, happy life.
5
naomi r.
Love these socks. They really keep my feet very warm
$96.97-$130.00
WAS: $130.00*
slim fit to follow contours of the body made with merino sport yarn: combines durability and fast dry times of polyester seamlessly knit mesh ventilation designed to keep you dry and comfortable 3d mapping provides maximum mobility ribbed elbows provide added durability mesh zones for better...
5
LPaul
[ I was looking for wool thermal layer for my husband, who runs cold. Rather than settling on a bland look, I chose this colorblock version for its added style. While he does n't fill it out quite as nicely as the model(!), he looks great in it.
5
rahoran53
[ I bought the Smartwool to keep me warm and comfortable on a 12 day trek in Nepal. The performance was outstanding and, as advertised, it was very breathable to keep me warm and even cool in the afternoons. It has a very comfortable feel and looks great as well.
$130.00
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 dry and comfortable 3d mapping provides maximum mobility while ribbed elbows provide added durability lightweight, super- moveable top,...
$81.97
WAS: $110.00*
regular fit long sleeve
$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
See Price in Cart
WAS: $140.00*
our most advanced performance base layer is 3d- knit to provide a tailored fit with mesh ventilation to balance warmth and breathability ... insulation, articulation, and ventilation are seamlessly integrated to help with movement and comfort merino sport yarn helps combine the moisture management,...
$145.00
we 've updated the fit of our men's classic thermal merino base layer 1/4 zip to improve functionality while also enhancing aesthetics. ... size medium center- front zipper: 10 '' ''( 25 cm) machine wash warm gentle cycle wash with like colors do not bleach tumble dry low cool iron as needed do not...
See Price in Cart
WAS: $125.00*
slim fit intended to follow the contours of your body fabric helps combine the moisture management, temperature regulation, and odor resistance of 100% merino wool with interlock knit for comfort flatlock seam construction and offset shoulder and side seams designed to help increase comfort and...
See Price in Cart
WAS: $140.00*
slim fit intended to follow the contours of your body featuring
$64.95
fit and design interlock knit covered elastic waistband adds comfort flatlock seam construction designed to eliminate
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.
4
020105ma
[ My kids have worn Smartwool base layers for years and they generally do the job of keeping them warm, comfortable and without manmade toxic fibers. The quality/weight/weave of the wool varies from style to style. It seems like the prints are a bit stronger than the solid colors. We buy the wool because we ca n't find a non- animal, non- toxic alternative base layer fiber-- if you have any ideas, please respond!
See Price in Cart
WAS: $79.95*
Excellent for cold days on the water! ... The best midlayer I own. ... Superb fit and comfortable. ... A zippered pocket on either leg would be cool. ... These are great pants, they stretch out to wear over layers if
5
THOMASR
Fit well true to size, easy on and off. what ’s really nice is I can stop at a restaurant or grocery store on my way home after hunting and feel very comfortable in just them.
5
Doug
These are awesome! Surprisingly comfortable and perfect under waders.
5
JoelT
The best midlayer I own. They are super comfy and nice and warm. Only this I wish they had was a rear pocket for my wallet. I would definitely buy again!
5
SidE
25 out this morning water 56 and I am very warm with these under my waders!! So far very happy!!
5
HankI
Superb fit and comfortable. I like these because I can wear them all day fishing and still stop off afterward in them. They are well thought out.
$65.00
Soft and warm ... We do n't need any additional layers, just this top under a coat, and they 're warm enough, skiing in Michigan in 10- 20* weather. ... Keeps warm and matches
5
JessAK
[ I live in Interior Alaska. These base layers will keep your kids warm, worth every penny. Carefully launder them and they will last from kid to kid!
$89.97-$120.00
WAS: $120.00*
The softness and temperature regulation make this my favorite baselayer. ... I am so glad that SmartWool has decided to offer plus- size clothing for women and I hope they expand with even more
$120.00
The styling is also extremely flattering. ... made with 100% merino wool for enhanced comfort, breathability, thermoregulation and odor resistance so you can conquer the cold in
5
Camper at heart
[ The black cherry color is very flattering. I ordered based on true body measurements and the size chart resulting in a perfect fit. The styling is also extremely flattering. The neck is not too tight and not too loose. I love the length of the body and the sleeves. The garment care is oh so easy.
Continue browsing
(1) 
