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Men's Thermal Underwear
Shop men’s thermal underwear in lightweight to heavyweight sets, moisture-wicking synthetics and merino wool, crew and henley tops, plus base-layer bottoms for cold days.
Men’s Thermal Underwear
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50+ stores, 80+ brands, 200+ products
Evo
Smartwool Classic Thermal Merino Base Layer Bottoms - Men's
$115
Filson
400g Merino Wool Bottoms - Dark Olive
$199
Aether Apparel
Premium Merino Base Layer Pant
$125
Decathlon
Forclaz Men's MT500 Merino Wool Base Layer Tights
$79.99
Icebreaker
Men's 300 MerinoFine™ Polar Thermal Leggings
$200
Filson
400g Merino Wool Bottoms - Black
$199
Decathlon
Forclaz Men's Mountain Backpacking Merino Wool Base Layer Tights Leggings - MT900
$99.99
Quince
4.9 (92)100% Merino Wool Cold Weather Base Layer Bottoms
$54.90
Here are a mix of men’s thermal underwear options—budget-friendly synthetics, waffle-knit, and warmer merino wool base layers.
Warmth level?
Lightweight
Midweight
Heavyweight / Expedition
Material preference?
Merino wool
Synthetic (poly/nylon)
Cotton / Waffle knit
Silk / Wool blend
What do you need?
Bottoms
Top
Set (top + bottom)
3/4 length bottoms
SuggestionsShow me merino wool options first
I need a full set (top + bottom)
I want the warmest heavyweight base layers
I’m using these for skiing/snowboarding
Just show me good budget picks
