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The helmet is a protective gear used to protect the head. It is a hat worn by military personnel during training and combat, and is an indispensable tool in people's transportation. It is mostly semi-circular and consists mainly of a casing, a lining and a suspension. The outer casing is made of special steel, glass reinforced plastic, reinforced plastic, leather, nylon and other materials to protect the head from warheads, shrapnel and other hitters. The helmet can be traced back to ancient times. Primitive people chase the beasts and fights, and protect their heads with fibrous shells such as coconut shells and large turtle shells. To block the attack. Later, with the development of metallurgical technology and the needs of war, metal helmets were invented.