Home
Favorites'/%3e%3cpath%20d='M36.2522%2031.9997V57.4062C17.2521%2068.3768%2014.2492%2066.6426%2014.25%2044.7027L36.2522%2031.9997ZM36.2522%206.5938V31.9997H50.8786L58.2553%2019.2974C58.2562%20-2.64258%2055.2523%20-4.37691%2036.2522%206.5938Z'%20fill='url(%23paint1_linear_40000384_16541)'/%3e%3cpath%20d='M58.257%2019.2969L36.2538%2031.9992L14.2507%2019.2969C-4.75024%2030.2661%20-4.75024%2033.7324%2014.2507%2044.7017C33.2516%2055.6708%2039.256%2055.6708%2058.257%2044.7017C77.2579%2033.7324%2077.2579%2030.2661%2058.257%2019.2969Z'%20fill='url(%23paint2_linear_40000384_16541)'/%3e%3cpath%20d='M58.2539%2044.7026L36.2518%2031.9996L28.9103%2019.2967L36.2518%206.59375C55.2507%2017.5639%2058.253%2022.764%2058.2539%2044.7026Z'%20fill='url(%23paint3_linear_40000384_16541)'/%3e%3cpath%20d='M14.25%2044.7026L36.2522%2031.9996V6.59375C17.2532%2017.5639%2014.2509%2022.764%2014.25%2044.7026Z'%20fill='url(%23paint4_linear_40000384_16541)'/%3e%3cdefs%3e%3clinearGradient%20id='paint0_linear_40000384_16541'%20x1='58.2539'%20y1='44.8665'%20x2='14.2486'%20y2='44.8665'%20gradientUnits='userSpaceOnUse'%3e%3cstop%20stop-color='%23FE6767'/%3e%3cstop%20offset='1'%20stop-color='%23F5AD05'/%3e%3c/linearGradient%3e%3clinearGradient%20id='paint1_linear_40000384_16541'%20x1='14.25'%20y1='44.1541'%20x2='58.2543'%20y2='44.1541'%20gradientUnits='userSpaceOnUse'%3e%3cstop%20stop-color='%230471C4'/%3e%3cstop%20offset='1'%20stop-color='%230BCB9B'/%3e%3c/linearGradient%3e%3clinearGradient%20id='paint2_linear_40000384_16541'%20x1='0'%20y1='32.0955'%20x2='72.5077'%20y2='32.0955'%20gradientUnits='userSpaceOnUse'%3e%3cstop%20stop-color='%23FCDA2E'/%3e%3cstop%20offset='1'%20stop-color='%2342F098'/%3e%3c/linearGradient%3e%3clinearGradient%20id='paint3_linear_40000384_16541'%20x1='58.2539'%20y1='44.7026'%20x2='14.25'%20y2='44.7026'%20gradientUnits='userSpaceOnUse'%3e%3cstop%20stop-color='%23FE6767'/%3e%3cstop%20offset='1'%20stop-color='%23F5AD05'/%3e%3c/linearGradient%3e%3clinearGradient%20id='paint4_linear_40000384_16541'%20x1='14.25'%20y1='44.7026'%20x2='58.2546'%20y2='44.7026'%20gradientUnits='userSpaceOnUse'%3e%3cstop%20stop-color='%230471C4'/%3e%3cstop%20offset='1'%20stop-color='%230BCB9B'/%3e%3c/linearGradient%3e%3c/defs%3e%3c/svg%3e)
Men's Extreme Cold Thermal Underwear
Shop men's extreme cold thermal underwear in heavyweight base layers with brushed fleece, merino blends, and compression fits for skiing, work, and winter travel.
Men’s extreme-cold thermal underwear
'%20fill='url(%23paint0_linear_40000350_16299)'/%3e%3crect%20width='10.402'%20height='10.402'%20rx='2.98373'%20transform='matrix(0.501438%20-0.865194%20-0.501372%20-0.865232%2010.125%2019)'%20fill='url(%23paint1_linear_40000350_16299)'/%3e%3crect%20width='10.402'%20height='10.402'%20rx='2.98373'%20transform='matrix(0.501438%20-0.865194%20-0.501372%20-0.865232%2013.708%2019)'%20fill='url(%23paint2_linear_40000350_16299)'/%3e%3cdefs%3e%3clinearGradient%20id='paint0_linear_40000350_16299'%20x1='12.8344'%20y1='13.7599'%20x2='-6.07512'%20y2='4.63446'%20gradientUnits='userSpaceOnUse'%3e%3cstop%20stop-color='%2342F098'/%3e%3cstop%20offset='1'%20stop-color='%230471C4'/%3e%3c/linearGradient%3e%3clinearGradient%20id='paint1_linear_40000350_16299'%20x1='12.1226'%20y1='6.92181'%20x2='-2.91641'%20y2='-0.597687'%20gradientUnits='userSpaceOnUse'%3e%3cstop%20stop-color='%2342F098'/%3e%3cstop%20offset='1'%20stop-color='%23FCDA2E'/%3e%3c/linearGradient%3e%3clinearGradient%20id='paint2_linear_40000350_16299'%20x1='-8.48011'%20y1='-8.45069'%20x2='9.95429'%20y2='9.98452'%20gradientUnits='userSpaceOnUse'%3e%3cstop%20stop-color='%23FCDA2E'/%3e%3cstop%20offset='1'%20stop-color='%23FE6767'/%3e%3c/linearGradient%3e%3c/defs%3e%3c/svg%3e)
50+ stores, 80+ brands, 200+ products
Filson
400g Merino Wool Bottoms - Dark Olive
$199
Icebreaker
Men's 300 MerinoFine™ Polar Thermal Leggings
$200
Evo
evo Heavyweight Merino Wool Pants - Men's
$69.96
Carhartt
4.5 (23)Men's Base Layer Thermal Shirt - Carhartt Force® - Heavyweight - Heathered Knit
$57.99
Filson
400g Merino Wool Bottoms - Black
$199
Icebreaker
Men's 260 ZoneKnit™ Thermal Leggings
$175
REI
4.1 (16)Capilene Thermal Weight Long-Underwear Bottoms - Men's
$99
Aether Apparel
Polar Base Layer Pant
$135
Here are some men’s extreme-cold thermal underwear options—heavyweight base layers, including merino and thermal-weight styles.
Preferred material?
Merino Wool
Synthetic (Poly/Spandex)
Fleece-Lined
Waffle Knit
What do you need?
Top
Bottom
Set (Top + Bottom)
Primary use?
Ski/Snowboard
Outdoor Work
Hunting
Everyday Winter
Sleeping/Camping
SuggestionsShow me the warmest merino options
I want a top + bottom set for extreme cold
I need something for skiing—moisture-wicking and very warm
I want fleece-lined thermals
Can you explain what “thermal weight” vs “midweight” means?
