Thorlos Unisex SL Ski Padded Over the Calf Sock 77% THORWICK WARM acrylic, 20% nylon, 3% spandex Made in US Turn Inside Out-Machine Wash-Use Liquid Fabric Softner Exclusive Thor wick fiber for maximum wicking because a dry foot is a warm foot Thin cushioning in ball and heel for warmth shear protection and comfort Thin cushioning in shin to protect against shin bite Flat knit instep and arch for better fit and ventilation Suitable for Cross Country Touring and Telemark skiing