Safety belt is the belt used to ensure safety when using safety parts on equipment, flying aircraft and other aircraft, or working at height and performing skills. The main raw materials are polyester, polypropylene, nylon. The safety belt is not only composed of webbing, but also other parts. The ideal process of seat belt function is: first, tighten the seat belt in time and "press" the person on the seat without hesitation at the first moment of the accident. Then, relax the seat belt properly when the peak impact force has passed or when the person can be protected by the airbag.