Usually, the shell of the helmet is made of high-strength materials, such as metal, engineering plastics, Kevlar fiber, etc., through its deformation to absorb most of the impact; the lining material has the ability to absorb sweat, keep warm, and absorb shock. Military helmets often have the functi

In April 2020, it was learned from the Traffic Management Bureau of the Ministry of Public Security that the “One Helmet and One Belt” security guard operation will be carried out nationwide. During the operation, the public security traffic control department will strengthen law enforcement managem