NorCal Bikesport California Bear Cycling Sock by SockGuy. SockGuy's SGX socks are designed with the elite athlete in mind and feature our exclusive Elite Performance Formula. These socks rock and will outlast any other performance socks on the market today. The new SGX sock line provides a compression fit, performance ribbing, enhanced ventilation and a reduced friction profile. 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. Guaranteed to be the most comfortable performance socks you'll ever wear.