Darn Tough Annie Oakley Knee High Light Socks - Women's 5% lycra Made in USA Ultra soft, fine gauge Merino Wool makes them a year round, all weather favorite True Seamless construction gives them a smooth, almost invisible feel from start to finish 48% Merino Wool, 47% Nylon, 5% Lycra Spandex Men's Sizing Guide: Small (5.5-7.5), Medium (8-9.5), Large (10-12), X-Large (12.5+) Women's Sizing Guide: Small (4.5-7), Medium (7.5-9.5), Large (10-11.5)