An aerodynamic fit, protection without weight, running and multi-sport. Ultra-lightweight sock frame made of lycra mesh provides contoured aerodynamic glove-like fit and maximum breathability. Specially sculpted Thorlo pads in ball and heel provide protection from shear and impact in critical strike or impact zones. Lightweight Achilles tendon pad protects against rubbing and chafing, while functioning as a heel lock. Made in the USA | North Carolina. Engineered for aero-dynamic fit and protection without weight. 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. Nylon covered LYCRA® provides contoured aerodynamic glove-like fit. THOR•WICK®COOL fiber in the ball and heel pads provides enhanced moisture management. Mesh Polyester for maximum breathability for an ultra-lightweight sock. Fiber content: 81% THOR•WICK® COOL polyester, 18% nylon, 1% elastic.