Wigwam Women's Ironman Flash Pro Low Cut Running Sock 3-Pack 83% Nylon, 16% Acrylic, 1% Spandex Made in US Machine Wash Made in USA Features the ultimax moisture control system to protect against blisters and odor Features a cushioned sole for comfort while still providing a foot hugging fit Blister and odor free Unique heel tab reduces the chance of sock slippage into the shoe