The Sparco Soft Touch Socks are part of the all-new Delta RW-6 line of undergarments which are designed to provide both comfort and protection. The Delta RW-6 is made from a unique mixture of very comfortable soft fibers. The Delta RW-6 features woven mesh into key areas to enhance breathability. The undershirts are made with seamless sides with raglan sleeves to enhance comfort. Delta RW-6 includes long-sleeved undershirts, long underpants, a hood with a single opening, and a hood with a dual eye opening, knee-length socks and mid-calf socks. The hoods are one size fits all; undershirts and underpants are available in combination sizes. Delta RW-6 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. Socks are available in sizes from 38/39 to 46. The Delta RW-6 line is FIA approved.