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 rainforests partners with Conservation International to protect 20 tropical trees. Socks that protect the Arctic also works with Conservation International to protect the world’s vulnerable species from climate change impacts. Socks that Give Water provides safe water for one person for 18 months thanks to water.org. All of 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.