Shop Smartwool Base Layer Bottoms

Men's Classic Thermal Merino Base Layer Bottom

Women's Classic Thermal Merino Base Layer Bottom

Women's Classic All-Season Merino Base Layer Bottom

Men's Intraknit Thermal Merino Base Layer Bottom

Women's Intraknit Thermal Merino Base Layer Bottom

Men's Classic All-Season Merino Base Layer Bottom

Kid's Classic Thermal Merino Base Layer Bottom

Women's Classic Thermal Merino Base Layer Bottom

Men's Classic Thermal Merino Base Layer 3/4 Bottom

Men's Classic All-Season Merino Base Layer 3/4 Bottom

Men's Classic Thermal Merino Base Layer Bottom

Women's Classic Thermal Merino Base Layer Bottom Plus

Kids' Classic Merino Blend Base Layer Bottom

Men's Intraknit Thermal Merino Base Layer 3/4 Bottom

Women's Classic All-Season Merino Base Layer Bottom Plus

Men's Classic All-Season Merino Base Layer Bottom

Women's Classic All-Season Merino Base Layer Bottom

Men's Classic Thermal Merino Base Layer 3/4 Bottom

Women's Classic Thermal Merino Base Layer 3/4 Bottom

Men's Classic All-Season Merino Base Layer Bottom Boxed

Women's Classic Thermal Merino Base Layer 3/4 Bottom

Kids' Classic Thermal Merino Base Layer Bottom

Kids' Classic Merino Blend Base Layer Bottom Boxed

Women's Classic Thermal Merino Base Layer Bottom Plus

Women's Classic All-Season Merino Base Layer Bottom Plus

Women's Active Biker Short

Men's Intraknit Active Base Layer Bottom

Men's Merino Plant-Based Dye Boxer Brief

Men's Classic All-Season Plant-Based Dye Merino Base Layer Bottom

Women's Intraknit Thermal Merino Base Layer 3/4 Bottom