Shop Smartwool Base Layer Tops

Women's Classic Thermal Merino Base Layer Crew

Men's Classic Thermal Merino Base Layer Crew Top

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

Men's Intraknit Thermal Merino Base Layer Crew Top

Women's Intraknit Thermal Merino Base Layer Crew Top

Men's Classic Thermal Merino Base Layer Crew Top

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

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

Women's Thermal Merino Rib Turtleneck

Men's Classic Thermal Merino Base Layer Colorblock Crew Top

Men's Classic Thermal Merino Base Layer Crew

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

Men's Classic All-Season Merino Base Layer 1/4 Zippers Top

Women's Classic Thermal Merino Base Layer Crew Plus Top

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

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

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

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

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

Men's Classic All-Season Merino Base Layer Crew

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

Women's Classic Thermal Merino Base Layer Pattern Crew

Women's Classic All-Season Merino Base Layer 1/4 Zip

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

Women's Classic Thermal Merino Base Layer Crew Top

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

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

Men's Intraknit Thermal Merino Base Layer Colorblock Crew Top

Men's Classic Thermal Merino Base Layer Hoodie

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