Box One Performance 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 a reduced friction profile. These socks look and feel great. With the Stretch-to-Fit sizing and reinforced toe & heel, these SGX™ socks perform like no other. Guaranteed to be the most comfortable performance socks you'll ever wear. Click here to view sizing chart.