Thorlos Unisex SKX Ski Thick Padded Over the Calf Sock 59% Thorlon Acrylic, 39% Thorwick WARM Polyester, 2% Spandex Made in US Turn Inside Out-Machine Wash-Use Liquid Fabric Softner Thick cushioning in shin and instep protects against shin bite Moderate cushioning in arch for better fit Side vent panels for better circulation Exclusive fibers for maximum wicking because a dry foot is a warm foor