Anatomically engineered pads for foot protection to absorb impact while preventing blisters and irritation. Multi-spot design is crafted to allow you to run, walk and play longer. Lightweight Achilles Tendon pad protects against rubbing and chafing while functioning as a heel lock. THOR•WICK®COOL fiber in the ball and heel pads provides enhanced moisture management. Contoured aerodynamic glove-like fit and maximum breathability for an ultra lightweight sock. Fiber content: 63% THOR·WICK® COOL Polyester, 16% Nylon, 18% Polyester, 3% Elastic. Made in USA of domestic and imported yarns.