 This product is designed to help protect your feet from the damaging effects of impact, shear and blistering when exercise walking or simply walking for enjoyment. Extra THOR•LON® provides a maximum walking density padding to provide better durability, protection against shock, impact and shear forces. THOR•LON® top with added spandex provides comfort and better fit. Lightweight lace padding with added spandex provides maximum fit and ultimate arch support. Content: 78% THORLON Acrylic, 18% Stretch Nylon, 4% Spandex |