Exclusive THOR·LON® construction wicks moisture better. Thick cushioning in ball/heel for maximum protection against shock, impact and blisters caused by sudden stops and starts. Extended heel cushioning protects Achilles Tendon from pressure. Lightweight cushion over toes for pressure protection. Fiber Contents: 88% Exclusive THOR·LON® Acrylic, 10% Stretch nylon, 2% Spandex