Carbon fiber is a single fibrous carbon material. It is a new type of material with greater strength than steel, lower density than aluminum, corrosion resistance than stainless steel, high temperature resistance than heat resistant steel, and electrical conductivity like copper. It has many good electrical, thermal, and mechanical properties. . The carbon fiber helmet made of carbon fiber is light and strong, with high rigidity and 20 times the strength of iron. The carbon fiber helmet has both the strong tensile strength of carbon material and the soft processability of fiber. It is safe and lightweight.