What are the three parts of a helmet?

The helmet consists of three parts: shell, lining and chin strap. 1. Hat shell: The hat shell is the main part of the safety helmet, and generally adopts oval or hemispherical thin shell structure. 2. Hat lining: Hat lining refers to the part of the hat shell that directly contacts the top of the wearer's head. It consists of a hat belt, a top belt, a protective belt, a support belt, a sweat absorption belt, a cushion and a tether. 3. chin strap: chin strap is a strap that is tied to the chin to fix the helmet. The chin strap consists of a strap and a lock. "