Full helmet: it refers to a fully enclosed helmet. After wearing it, only the lens can be opened and closed, and the safety factor is high. The cushion material inside the helmet can protect every part of the head, which can better reduce the wind resistance and noise. This is why full helmets are used in motorcycle races. Wearing them in life is troublesome. Even if the lens is opened, the mouth is still blocked, In summer, it's quite hot when the car is stationary.

Half helmet: the safety factor is low, after all, it only protects three quarters of the head area, which is more convenient to wear. You can wear a helmet to communicate directly.

Uncover helmet: It is equivalent to a deformation of the whole helmet. Most of them are double lenses, which are suitable for motorcycle travel and urban commuting. You can drink directly with the helmet on the road, and most of them use sliding buckles. However, in special cases, the buckle may fall off, while the whole helmet uses double D buckles, which are more secure.

Cross country helmet: The extended brim is added to block the sun during the leap. The mouth has a large space to effectively protect the mouth and chin. Cross country glasses can be worn at the eye opening to prevent dust from entering the eyes. The full helmet has insufficient dust protection. It is mainly used for off-road riding on unpaved roads.