Say good bye to your superstitions in these black cat socks. These are pawsatively a must-have for your sock drawer. These seamless toe socks are made out of ultra-soft luxurious bamboo that is breathable and antibacterial. Sock size 9-11 fits U.S women's shoe size 5-10.5. 66% Bamboo From Rayon, 32% Nylon, 2% Spandex & OEKO-TEX certified (no harmful chemicals).