thorlos Thick Padded Calf Ski Sock 98% Other Fibers, 2% Spandex Made in US No Closure closure Machine Wash Fiber Contents: 59% Exclusive THOR. LON, 39% Exclusive THOR. WICK WARM, 2% spandex Thorlos clinically-tested padding under the ball, heel, Achilles, and on the shin provides maximum protection from friction, the Primary cause of blisters, and impact protection where needed most Exclusive THOR. WICK WARM is used for maximum WICKING because a dry foot is a warm foot Made in Statesville, North Carolina, USA 30 Day Guarantee: Thorlos feel better than ordinary socks. If you do not agree, send the socks and your receipt to Thorlos for a full refund.