DURABILT Adult Cotton Ankle Sport Sock (3-Pack) 10-13 Black 2% polyester Superb sock for working on your feet. Goes well with black/brown tennis shoes. Yarns: 84% cotton,7% nylon, 4% elastic, 3% lycra, 2%polyester Padded heel adds comfort and durability without adding bulk to sock Arch support with vents keeps your foot energized