REI Co-op Merino 185 Long-Sleeve Base Layer Top - Men's

REI Co-op Merino 185 Long-Sleeve Base Layer Top - Women's Plus

REI Co-op Lightweight Base Layer Half-Zip Top - Men's

REI Co-op Merino 185 Long-Sleeve Half-Zip Base Layer Top - Men's

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

Rei co-op long sleeve/1000 - Gem

REI Co-op Merino 185 Base Layer Bottoms - Women's Plus Sizes

Smartwool Intraknit Thermal Merino Crew Base Layer Top - Men's

REI Co-op Lightweight Base Layer Long-Sleeve Crew Top - Men's Tall

REI Co-op Merino 185 Long-Sleeve Base Layer Top - Men's Tall Sizes

Icebreaker 200 Oasis Long-Sleeve Crewe Glacial Flow Base Layer Top

REI Co-op Merino 185 Long-Sleeve Half-Zip Base Layer Top - Men's

Icebreaker 260 Zone Crew Base Layer Top - Men's

REI Co-op Merino 185 Long-Sleeve Half-Zip Base Layer Top - Men's

REI Co-op Silk Long Underwear Crew Shirt - Men's Tall Sizes

REI Co-op Merino 185 Long-Sleeve Half-Zip Base Layer Top - Women's