Carbon fiber is a single fibrous carbon material. It is a single strength than steel, density is smaller than aluminum, corrosion resistance than stainless steel, high temperature resistance than heat-resistant steel, and can conduct electricity like copper, with many good electrical, thermal and mechanical properties of new materials. Carbon fiber helmets made of carbon fiber are light and strong, rigid, and 20 times stronger than iron. The carbon fiber helmet has the two characteristics of strong tensile strength of carbon material and soft workability of fiber, which is safe and lightweight.