Shop Smartwool Underwear

Unisex Kids' Classic Thermal Merino Base Layer Bottom

Men's Merino Boxer Brief

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

Men's Merino Boxer Brief

Men's Active Boxer Brief

Men's Everyday Merino Boxer Brief

Men's Merino Boxer Brief

Women's Merino Bikini

Women's Intraknit Hipster

Men's Intraknit 6" Boxer Brief/Charcoal

Men's Merino Boxer

Women's Intraknit Bikini

Women's Everyday Merino Thong

Women's Everyday Merino Bikini

Men's Brief

Men's Wind Boxer Brief

Women's Intraknit Hipster

Men's Active Boxer Brief

Men's Merino Boxer Brief

Women's Intraknit Bikini

Men's Merino Plant-Based Dye Boxer Brief Boxed

Men's Everyday Merino Boxer Brief

Men's Merino Print Boxer Brief

Women's Merino Bikini

Men's Merino Sport Boxer Brief Boxed

Women's Merino Sport Seamless Hipster Boxed

Men's Merino Print Boxer Brief Boxed

Men's Intraknit Boxer Brief

Women's Merino Lace Thong Boxed

Men's Merino Boxer Brief Boxed