The principle of riding helmet is to play a protective role by absorbing the impact force of collision. In other words, every riding helmet has a foam inner layer. In case of an accident, the foam inner layer will cushion the collision to reduce the accident damage. Traditionally, many riding helmets are made of EPS (expanded polystyrene) materials. Once EPS foam is crushed and deformed in an accident, it cannot be recovered and reused.

The reason for wearing riding helmets is very simple and important - to protect the head and reduce injuries. According to relevant data, 75% of the more than 500 bicycle fatalities each year are caused by fatal head injuries. Medical research has found that wearing helmets on bicycles can prevent 85% of head injuries, and greatly reduce the degree of injury and accident mortality. Half-helmeted riding helmets are divided into road dedicated helmets (without brims), road and mountain dual-use helmets (with removable brims), etc.