thorlos Women's Ultra Thin Skiing Over-The-Calf Socks 65% Polyester, 29% Nylon, 6% Elastane Made in US No Closure closure Machine Wash Reinforced heel and toe areas provide increased durability without added thickness 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