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. The undershirts are made with seamless sides with raglan sleeves to enhance comfort. The RW-7 includes knee-length socks. The RW-7 undershirts and underpants are designed to fit close to the body due to the soft stretchable fabric. If you prefer a loose fit, please choose one size up. RW-7 shirts and underpants 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.