SockGuy's SGX socks are designed with the elite athlete in mind and features our exclusive Elite Performance Formula, a blend of PolyPro, nylon and spandex. The new SGX sock line provides a compression fit, performance ribbing, enhanced ventilation and awesome breathability. These socks feel great, look great, and with SockGuy's signature Stretch-to-Fit sizing and reinforced toe & heel, SGX socks perform like no other.