The 20 Best Base Layers to Keep You Warm All Winter Long

The best base layer tops and bottoms — from merino wool to bamboo — that'll keep you warm whether you're hiking, skiing or rock climbing this winter.

Meg Lappe, Author at Gear Patrol

Thermal Seamless Base Layer Top Black, 60% OFF

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Smartwool Merino 250 Base Layer Crew (Pewter Blue/Lead), 43% OFF