10 best thermal underwear 2023, tested by experts

We tested the best thermal underwear for extreme cold and base layers like tights made with merino wool and fleece from brands like Smartwool and Patagonia.

Related Keywords

Helly Hansen ,Barry Seymour ,Kari Traa ,Outdoor Research ,Paper Apparel Lab Product Analyst ,Merino Base Layer Crew ,Good Housekeeping Institute Textiles Lab ,Good Housekeeping Institute ,Sleeve Base Layer Top ,Cornell University ,Apparel Lab Product Analyst ,Long Sleeve ,Thermal Underwear ,Under Armour ,Warm Crew Neck Long Sleeve ,Moisture Wicking Capabilities ,Materials Science ,Fiber Science ,