Fiberglass is made of woven fibers, and is used as a reinforcing agent for many polymer products. The composite properly known as glass-reinforced plastic (GRP), is normally referred to by the name of its reinforcing material. Fiberglass fairings are commonly used on the race track.ull fairings cover both upper and lower portions of the motorcycle, as distinct from a half fairing, which only has an upper section, and leaves the lower half of the motorcycle exposed. The fairing on a race or sport bike is meant as an aerodynamic aid, so the windscreen is rarely looked through.