These calf-length socks from Sparco have been designed to meet the latest and most stringent FIA homologation for greater protection against heat and flames. The socks are light and have a soft touch that makes them very comfortable. They comply with the latest FIA homologation Greater protection against heat and flames Lightweight and comfortable Approved by FIA 8856-2018 Note: For the latest FIA homologation, socks are required to be longer than the ankle. These socks are long in length but are slightly shorter than usual calf length socks.