1. Foam buffer material shall be of high density, and those that can be easily dug by fingers shall be disqualified.

2. International brand helmets generally have certification materials such as DOT and ECE.

3. The lining must have padding, mesh, ventilation slot and air duct to achieve the effect of sweat absorption, ventilation and ventilation.

4. The weight should be light, not more than 4 jin.

5. When wearing the helmet, the vision is not blocked, and the direction and position of the surrounding sound can be clearly heard, and there is no other vibration sound.

6. The lens is clear without chromatic aberration, and the exterior color of the helmet is bright and eye-catching.

To sum up, it is necessary to be light, clear, and well ventilated; The field of vision should be wide and unobstructed without chromatic aberration.