Organic cotton not only makes these socks "green", but also provides superior softness. Classic design, the turn cuff can be pulled up for a full length crew sock. Due to the natural materials use, colors may vary slightly. Spandex is included to add stretch without compromising the lasting shape of the sock. Fits US shoe sizes 9-13 or sock size 10-12. Made from 70% Organic cotton 27% Nylon 3% Spandex.