Protect your feet with Nomex Socks or other available fire retardant fabrics. UPR Racing Supply has SFI and FIA rated Racing Socks from Alpinestars, Sparco Racing and RaceQuip. Racing socks come in different styles and are made from a variety of heat resistant fabrics. Also called “Fire Proof racing socks”, “SFI Nomex Socks” and “Nomex Socks”, they all perform a similar function which is to give you another heat resistant thermal barrier in your racecar. Sparco and Alpinestars both offer very breathable moisture wicking fabrics to help cool your feet as the perspiration evaporates from your skin. Wearing Racing Socks under your racing shoes also preserves the integrity of your shoes liner by absorbing moisture.