Wrightsock X-Fit Low Quarter Performance Sock - 2 Pack, Grey, X-Large Built with Dri-Fit II Fibers, the SLX 153 rapidly wicks moisture and sweat away, helping keep your feet comfortable and dry. To help secure a proper fit, the XFIT sock showcases a contoured design, and Y-heel to promote an anatomically correct fit Wrightsock's Stabilizer Zone helps keep the socks in place. Wrightsock's XFIT is perfect for all high impact activities including running, training, walking, aerobics, and intense workouts.