Shop Smartwool Base Layer Tops

Women's Classic Thermal Merino Base Layer Crew Top

Men's Classic Thermal Merino Base Layer Crew Top

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

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

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

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

Women's Intraknit Thermal Merino Base Layer Crew Top

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

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

Men's Intraknit Thermal Merino Base Layer Crew Top

Women's Thermal Merino Rib Turtleneck

Kid's Classic Thermal Merino Base Layer Crew Top

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

Men's Classic Thermal Merino Base Layer Crew

Women's Classic Thermal Merino Base Layer Crew Plus Top

Men's Classic Thermal Merino Base Layer Colorblock Crew Top

Men's Intraknit Thermal Merino Base Layer Colorblock Crew Top

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

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 Classic Thermal Merino Base Layer 1/4 Zip

Women's Intraknit Thermal Merino Base Layer Pattern Crew Top

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

Women's Intraknit Thermal Max Merino Base Layer Pattern Hoodie

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

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

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

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

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

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