Suitable for any cathletic activity, we’re pawsitive you’re going to love these Black Cat Bamboo socks! Even the most superstitious people can't help but want to sink their claws into these sleek black cat socks. Sock size 9-11 fits U.S. women’s shoe size 5-10.5. Fiber Content: 62% Rayon From Bamboo, 36% Nylon, 2% Spandex.