Thorlos Unisex XSKI Ski Ultra Thin Over the Calf Sock 47% Thor-Wick WARM polyester, 26% Nylon, 23% polyester, 4% Spandex Turn Inside Out-Machine Wash-Use Liquid Fabric Softner Thin cushioning in ball and heel for warmth, shear protection and comfort Thin cushioning in shin and instep to protect against shin bite Ultra thin cushion in arch for comfort and fit Exclusive Thor*Wick for maximum wicking because a dry foot is a warm foot