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Men's Thermal Underwear Bottoms
Shop men’s thermal underwear bottoms in lightweight and heavyweights, merino and synthetic knits, base-layer leggings and long johns for cold-weather layering.
Men’s Thermal Underwear Bottoms
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40+ stores, 70+ brands, 200+ products
Arc'teryx
Rho SV Bottom Men's
$120
Carhartt
4.4 (57)Men's Base Layer Thermal Pants - Carhartt Force® - Heavyweight
$54.99
Carhartt
4.1 (66)Men's Base Layer Thermal Pants - Carhartt Force® - Midweight
$38.99
Evo
Smartwool Classic Thermal Merino Base Layer Bottoms - Men's
$115
Aether Apparel
Premium Merino Base Layer Pant
$125
Decathlon
Forclaz Men's MT500 Merino Wool Base Layer Tights
$79.99
REI
4.3 (7)Icebreaker 200 ZoneKnit Merino Thermal Base Layer Leggings - Men's
$109.73
Icebreaker
Men's 300 MerinoFine™ Polar Thermal Leggings
$200
Filson
400g Merino Wool Bottoms - Dark Olive
$199
Filson
400g Merino Wool Bottoms - Black
$199
Quince
4.9 (92)100% Merino Wool Cold Weather Base Layer Bottoms
$54.90
Arc'teryx
Rho LT Bottom Print Men's
$120
Here are a bunch of men’s thermal underwear bottoms (long johns/base layer pants)—from budget basics to merino-heavy cold-weather options.
Best use?
Everyday warmth
Ski/snowboard
Hiking/outdoors
Workwear (job site)
Lounging/sleep
Preferred material?
Merino wool
Synthetic (poly/nylon)
Cotton/waffle knit
Blend
Warmth level?
Lightweight
Midweight
Heavyweight
SuggestionsShow me merino wool base layer bottoms
I need heavyweight thermals for very cold weather
I want something affordable but decent quality
I’ll be active—something breathable that won’t get clammy
Can you explain the difference between 200/260/300 merino weights?
