Shop Smartwool Base Layer Tops

Men's Classic All-Season Merino Base Layer Long Sleeve Top

Women's Classic Thermal Merino Base Layer Crew Top

Men's Classic Thermal Merino Base Layer 1/4 Zippers Top

Men's Classic Thermal Merino Base Layer Crew Top

Women's Classic Thermal Merino Base Layer 1/4 Zippers Top

Women's Classic All-Season Merino Base Layer Crew Top

Women's Intraknit Thermal Merino Base Layer Crew Top

Men's Intraknit Thermal Merino Base Layer Crew Top

Women's Classic Thermal Merino Base Layer 1/4 Zippers Top

Women's Classic Thermal Merino Base Layer Crew Top Boxed

Men's Intraknit Thermal Max Merino Base Layer 1/4 Zippers Top

Men's Intraknit Thermal Merino Base Layer 1/4 Zippers Top

Women's Classic Thermal Merino Base Layer Crew Plus Top

Women's Intraknit Thermal Merino Base Layer Colorblock 1/4 Zippers Top

Women's Classic Thermal Merino Base Layer 1/4 Zippers Plus Top

Men's Intraknit Thermal Merino Base Layer Colorblock Crew Top

Kids' Classic Thermal Merino Base Layer Crew Top

Men's Classic Thermal Merino Base Layer Crew Top Boxed

Women's Classic All-Season Merino Base Layer Crew Top Plus

Women's Classic All-Season Merino Base Layer Crew Top Boxed

Women's Classic Thermal Merino Base Layer 1/4 Zippers Top Boxed

Men's Classic All-Season Merino Base Layer Crew Top Boxed

Kids' Classic Thermal Merino Base Layer Crew Top Boxed

Women's Intraknit Thermal Merino Base Layer Pattern Crew Top

Men's Classic Thermal Merino Base Layer 1/4 Zippers Top

Women's Classic Thermal Merino Base Layer 1/4 Zip Plus

Women's Intraknit Thermal Merino Base Layer 1/4 Zip

Kids' Classic Thermal Merino Base Layer 1/4 Zippers Top Boxed

Men's Classic Thermal Merino Base Layer 1/4 Zip Boxed

Men's Classic All-Season Merino Base Layer Long Sleeve Top