helmet, adult helmet, bicycle helmet

Helmet is a protective device used to protect the head. It is a hat worn during training and combat, and it 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 damage to the head from bullets, fragments, and other impact objects. In ancient China, it was known as the Zhou, the first armor, the dummy helmet, or the head helmet.