Socks made by Conscious Step help people, animals and the environment. These are Socks that Protect Zebras. Each pair works with Conservation International to combat illegal wildlife trafficking/ protect critical wildlife habitats. Large fits USA Men's 8-13, USA Women’s 9-14. Small fits USA Men’s 4-8, USA Women’s 5-9. The socks are made of 75% Organic Cotton, 23% Polyamide, 2% Spandex and have a seamless toe. Machine wash warm and lay flat to dry.