Shop Smartwool Underwear

Men's Brief

Men's Merino Boxer Brief

Women's Merino Bikini

Unisex Kids' Classic Thermal Merino Base Layer Bottom

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

Men's Active Boxer Brief

Men's Merino Boxer Brief

Men's Everyday Merino Boxer Brief

Women's Intraknit Hipster

Men's Active Boxer Brief

Women's Intraknit Bikini

Women's Intraknit Hipster

Women's Everyday Merino Thong

Women's Merino Bikini

Men's Merino Boxer Brief

Women's Everyday Merino Bikini

Women's Intraknit Bikini

Men's Merino Boxer

Men's Intraknit Boxer Brief

Men's Intraknit 6" Boxer Brief/Charcoal

Men's Wind Boxer Brief

Men's Merino Print Boxer Brief

Men's Everyday Merino Boxer Brief

Men's Intraknit 6" Boxer Brief

Men's Merino Boxer Brief

Women's Everyday Merino Thong

Men's Merino Plant-Based Dye Boxer Brief Boxed

Women's Merino Sport Seamless Hipster Boxed

Men's Merino Print Boxer Brief Boxed

Women's Merino Lace Thong Boxed