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 Give Water provides safe water for one person for 18 months thanks to water.org. These are size medium which fits USA Men' 13+ and Women's 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.