Thorlos Unisex XSKI Ski Ultra Thin Over the Calf Sock 47% Thor-Wick WARM polyester, 26% Nylon, 23% polyester, 4% Spandex Made in US Turn Inside Out-Machine Wash-Use Liquid Fabric Softner Key Benefits: Precise fit; dry, warm foot Guarantee - Your feet will feel better or your money back! Proudly MADE in the USA | North Carolina Exclusive THORWICK WARM is used for maximum WICKING because a dry foot is a warm foot Extra Spandex in the ankle for PRECISE FIT Pique stitching in the calf and arch for STRETCH and FIT Reinforced flat knit for WARMTH, PROTECTION and COMFORT Padding in the ball and heel absorbs shock and is specifically engineered for protection and comfort while playing tennis Fiber Contents: 65% Exclusive THORWICK WARM, 29% nylon, 6% spandex