Shop Smartwool Base Layer Tops

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

Women's Thermal Merino Rib Turtleneck

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

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 Classic Thermal Merino Base Layer Crew Top

Men's Intraknit Thermal Merino Base Layer Crew Top

Men's Classic Thermal Merino Base Layer Crew Top

Women's Intraknit Thermal Merino Base Layer Crew Top

Women's Classic Thermal Merino Base Layer Crew

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

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

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

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

Men's Classic Thermal Merino Base Layer Hoodie

Men's Everyday Party Short Sleeve Button Down T-Shirt

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

Men's Intraknit Thermal Merino Base Layer Colorblock Crew Top

Men's Classic Thermal Merino Base Layer Crew

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

Women's Classic Thermal Merino Base Layer Crew Plus Top

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

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

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

Men's Classic Thermal Merino Base Layer Colorblock Crew Top

Women's Classic Thermal Merino Base Layer 1/2 Zippers Hoodie

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

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

Women's Classic Thermal Merino Base Layer Crew Plus