Shop Smartwool Base Layer Bottoms

Women's Classic Thermal Merino Base Layer Bottom

Men's Classic Thermal 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 Bottom

Men'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 Bottom Plus

Men's Merino Sport Fleece Wind Tight

Men's Classic All-Season Merino Base Layer Bottom

Men's Intraknit Thermal Merino Base Layer Bottom

Women's Classic All-Season Merino Base Layer Bottom

Women's Intraknit Thermal Merino Base Layer Bottom

Women's Classic Thermal Merino Base Layer Bottom

Women's Classic Thermal Merino Base Layer Bottom Plus

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

Kids' Classic Merino Blend Base Layer Bottom

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

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

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

Kids' Classic Thermal Merino Base Layer Bottom

Men's Classic All-Season Merino Base Layer Bottom

Women's Classic All-Season Merino Base Layer Bottom

Kids' Classic Merino Blend Base Layer Bottom Boxed

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

Women'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