REI Winter Sports Base Layers & Thermals for sale

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Base Layers, Thermal Underwear & Long Underwear

REI Winter Gear Sale 2023: Save Over 50% on Tons of Top Brands

Kids' Base Layers

REI Merino Midweight Baselayer Top Review

The 5 Best Base Layers of 2024

REI Co-op Holiday Warm Up Sale: 2023 Outdoor Gear Guide

Made from premium merino wool, the Smartwool Classic Thermal Merino Crew base layer top helps regulate your temperature and keep you warm while hiking

Classic Thermal Merino Crew Base Layer Top - Men's

Women's Base Layers

The North Face Base Layers: Sale, Clearance & Outlet

Base Layers, Thermal Underwear & Long Underwear

Women's Base Layers: Sale, Clearance & Outlet