The RW-7 line of undergarments are designed to provide both comfort and protection. The RW-7 is made from a unique mixture of very comfortable and soft fibers. RW-7 socks are treated with Sparco’s X-Cool treatment, which draws heat from the body surface to cool the driver. In addition to cooling the driver, x-cool treatment has an anti-bacterial effect.   You'll stay cooler and more comfortable even in the most strenuous environments. X-cool treatment ensures optimal hygiene for every race.