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

REI Co-op Midweight Base Layer Half-Zip Top - Women's

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

REI Co-op Midweight Bottoms Review

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

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

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

Smartwool Intraknit Thermal Merino Base Layer Bottoms - Men's

REI Co-op Midweight Bottoms Review

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

An ideal performance layer when the mercury drops, the men's REI Co-op Base Layer Bottoms boast a smooth face and low-bulk seams for easy layering and

Midweight Base Layer Bottoms - Men's

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

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

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