Sparco RW-10 Fire Resistant Racing Compression Socks - FIA 8856-2018Sparco's RW 10 Socks are the only FIA approved compression socks on the market. It's unique helical structure generates a gradual Class 1 compression force. Using the same principles found in other action sports, the gradual compression helps facilitate blood flow through the foot, ankle and calf, helping to minimize muscle fatigue and increase driver comfort and focus.