Socks made by Conscious Step help people, animals and the environment. The purchase of each pair works with a partner to help the environment. Socks that protect the Arctic works with Conservation International to protect the world’s vulnerable species from climate change impacts.These are size large which fits USA Men's 8-13, USA Women’s 9-14. 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.