Thorlos Women's 84 N Running Thick Padded Low Cut Sock 72% THORLON acrylic , 19% Nylon, 7% Elastic, 2% Polyester Made in USA No Closure closure Turn Inside Out-Machine Wash-Use Liquid Fabric Softner Padding Level: Maximum Cushion Key Benefits: Maximum Protection + Maximum Ventilation = Maximum Comfort Guarantee: Your feet will feel better or your money back! Proudly MADE in the USA | North Carolina Women's specific design includes extra stretch yarn in the ankle and arch, a smaller heel pocket and a smaller custom toe box for a superior fit