The helmet is composed of a buffer layer, an outer shell, a webbing, an inner lining, a brim, and a chin guard.
The outer shell is the first line of defense to protect the helmet, preventing external hard objects from directly hurting the hat body. The commonly used materials are ABS engineering plastics and PC materials.

The cap body is mainly the buffer layer inside the helmet, which is used to absorb the external impact force. When the impact occurs, it will shatter to achieve the effect of absorbing the impact force. The material is mainly high-density EPS material, which is often referred to as the foam material, but it is not the white material we see every day, but mostly imported black EPS foam with higher density.

Cycling helmet manufacturers, other materials for helmets.
The webbing is the buckle and restraint straps configured on the helmet, that is, those wire straps used to fix the head. The material selection is also very explained, because it is in direct contact with human skin, so silky and soft webbing is mostly used as the material.
The inner lining is a material placed inside the helmet, which has the effect of absorbing sweat and breathable to ensure the comfort of wearing the helmet; it can be disassembled and cleaned by hand.

Chin guards and brims are generally used for helmets under certain conditions, such as mountain bike helmets or competitive helmets.
Of course, according to the design of helmets and the needs of user groups, not all helmets have the structures mentioned above. For example, construction site helmets and common shared electric vehicle helmets on the road do not contain EPS materials. So what kind of helmet to choose depends on your needs.