For most motorsport race series' Fireproof Racing Underwear is a requirement, although you won't need it at some national-level competitions.

Obviously, this adds to the level of resistance your attire has to the impact of bare flames, but being close to the skin, racing underwear also needs to help a driver perform while in the car.

A good motorsport racing underwear will assist in the wicking of sweat, while some will help to control the heat by transferring it away from the body.