Alpinestars Race Socks are lightweight, durable and ergonomically designed to meet the demands of the world’s top drivers. Complying with FIA regulations, Alpinestars' underwear keep drivers safe and comfortable in their world title pursuits. FIA Homologated 8856-2000 80gr 95 percent Meta, 5 percent Para Aramid Fiber Fabric (Kevlar®). Kevlar® included for softer feel and precise fit. Calf Length.