Pack includes 3 rib-knit tanks. U-neck, sleeveless shoulder straps. Soft-washed, lightweight rib-knit cotton. Go-Dry moisture-wicking technology keeps you dry & comfortable. Basic Multi Pack only: 100% cotton (solid colors); 60% cotton, 40% polyester (heather gray color only). Tag-free label inside neck for added comfort. Fitted through body. Tank hits below waist. Size XS = 36-37 chest. Size S = 38-39 chest. Size M = 40-42 chest. Size L = 44-46 chest. Size XL = 48-50 chest. Machine wash and dry. cotton 100% . Best Holiday gift for Men , perfect Tanks for Christmas!