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

REI Co-op Midweight Base Layer Crew Top - Men's

REI Co-op 650 Down Hoodie - Men's

REI Co-op Midweight Base Layer Crew Top - Men's

Hard-charging winter days start out cold, but you always warm up. The men's REI Co-op Midweight base layer half-zip top offers the warmth of long

Midweight Base Layer Half-Zip Top - Men's

Arc'teryx Rho Heavyweight Zip-Neck Base Layer Top - Men's

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

Men's Lightweight Base Layer Tops

Mountain Hardwear Summit Grid Long-Sleeve Crew Shirt - Men's

Soft, moisture-wicking 100% merino wool makes the men's REI merino midweight base layer top an ideal next-to-skin layer for high-performance

Merino Midweight Base Layer Long-Sleeve Crew Top - Men's

REI Co-op Midweight Base Layer Crew Top - Men's

Moisture Wicking Men's Tops

Smartwool Intraknit Thermal Max Quarter-Zip Base Layer Top - Men's