Helmet is used to protect the head.protective equipment. It is a hat worn during training and combat, and is an indispensable tool in people's transportation. It is mostly semi-circular in shape and consists of three main parts: the shell, the lining, and the suspension device. The shell is made of materials such as special steel, glass fiber reinforced plastic, reinforced plastic, leather, and nylon, to resist the harm to the head from bullets, fragments, and other projectiles. In ancient China, it was known as the "helm", "head armor", "helmet", or "head".helm
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