Safety harnesses and accessories work to keep racecar drivers restrained in a vehicle without being overly uncomfortable. They come in a variety of options and in different sizes, but the key purpose is to keep the driver in the seat even in the event of an accident on the road or track. It prevents the driver from being thrown from the vehicle or severely jostled. They are a very comprehensive form of a seat belt. The accessories drivers can use for their harness include things like harness padding which helps to ensure that the driver is comfortable while they tighten the harness enough to prevent the body from excessive movement.