The CEP Progressive Run Sock 2.0 is made with filament fibers for extreme durability. It has a wide top band and anatomical design for a perfect fit and an extra-flat toe seam to prevent pressure points.More energy, greater endurance and enhanced performance thanks to improved blood circulation.Activates the flow of blood in the muscles.Muscle and joint stabilization for reduced risk of injury.Increased coordination by activating the muscles for a sense of stability and security when running.85% polyamide, 15% spandex.