Shop Smartwool Base Layer Bottoms

Women's Classic Thermal Merino Base Layer Bottom

Men's Classic Thermal Merino Base Layer Bottom

Women's Classic Thermal Merino Base Layer Bottom Plus

Women's Classic Thermal Merino Base Layer Bottom

Men's Classic Thermal Merino Base Layer Bottom

Women's Classic All-Season Merino Base Layer Bottom

Men's Classic Thermal Merino Base Layer Bottom

Men'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 3/4 Bottom

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

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

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

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

Kids' Classic Thermal Merino Base Layer Bottom

Women's Classic All-Season Merino Base Layer Bottom

Men's Classic All-Season Merino Base Layer Bottom

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

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

Women's Classic Thermal Merino Base Layer Bottom Plus

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

Women's Classic All-Season Merino Base Layer Bottom

Men's Intraknit Active Base Layer Bottom

Men's Classic All-Season Merino Base Layer Bottom

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

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

Men's Intraknit Merino 200 Bottom

Men's Merino Plant-Based Dye Boxer Brief

Women's Merino 150 Plant-Based Dye Bottom