Valdler Men's 3 Pairs Pack Cotton Winter Socks With Gift Box 60% bamboo fiber/25% cotton/13% nylon/2% spandex Size: Free size (fit the most for EU 39-44 /US 6-9). Material:60% bamboo fiber,25% cotton,13% nylon,2% spandex. Machine Washable. Breathable, sweat-absorbent. Mid Calf Length.