 This product is designed to help protect your feet from the damaging effects of impact, shear and blistering common to running/jogging. Extra THOR•LON® provides a maximum running density padding to provide better durability, protection against shock, impact and shear forces. THOR•LON® top with added spandex provides protection and better fit Lightweight padding in arch for better fit and arch support. Content: 88% THORLON Acrylic, 10% Stretch Nylon, 2% Spandex Note: See Thorlo "King Size" Running Crew for Size 15 |