Patented moisture control system keeps feet cool, comfortable and protected from blisters. Side vent, mesh breather panels enhance air-flow in the sock, while the foot hugging fit extends up the leg and over the calf, for support and enhanced circulation. • Content: 32% X2O™ Acrylic, 32% Stretch Nylon, 18% Polyester, 15% Olefin, 3% Spandex |