REI Co-op Midweight Base Layer Bottoms - Men's

REI Co-op Merino 185 Base Layer Bottoms - Men's

Helly Hansen Lifa Merino Midweight Base Layer Pants - Men's

REI Co-op Merino 185 Base Layer Bottoms - Men's

REI Co-op Merino Midweight Base Layer Bottoms - Kids

The Best Budget Base Layers: REI Co-op Midweight Base Layer Review

Cotopaxi Teca Fleece Full-Zip Jacket - Men's

Men's Base Layer Bottoms & Thermal Underwear

Smartwool Classic All-Season Merino Base Layer Bottoms - Men's

Best Base Layers of 2024 – iRunFar