L code: 58-62cm
M code: 55-58cm
S code: 5 1-55cm
1, because everyone's head is different, you need to measure your head accurately before buying a helmet. Measure the head size, that is, measure the head circumference from the brow bone to the back of the head. When buying a helmet, you need to choose a helmet 2~3cm larger than the head circumference, which is the most comfortable to wear.
2. The helmet must be equipped with an impact pad, and the surface pad matched with the head is a thin mesh interlining, which has the functions of absorbing sweat and grease on the head. In addition, the cushion should be provided with a ventilation slot with a depth greater than 10MM to circulate the air in the helmet.
3. The jaw strap should be soft, and the snap fasteners and other hard protrusions should not exceed the outer surface by 5 mm ..
Matters needing attention in motorcycle helmet purchase
1. When choosing a helmet, you should consider the burden borne by your neck when wearing it, and feel its weight when your body is balanced. The balance of the helmet is very important, because the closer the center of gravity of the helmet is to the center of gravity of the head, the less likely it is to get tired. Therefore, what matters is not the weight of the helmet itself, but the balance performance of the helmet.
2. The helmet should be free from occlusion and sulking, with a clear and wide field of vision, and the viewing angle at rest should not be less than 105 degrees. In this way, when wearing the helmet, you can clearly hear and distinguish the sounds in all directions, and there should be no vibration and other noise during driving.
3, safety helmet should have good ventilation and warm device, and can be dustproof, insect-proof, waterproof, etc.
4, the helmet should have good reflective and thermal radiation resistance, highlighting the obvious eye-catching color.
5. The lens of helmet goggles should be clear and colorless, with good toughness and not easy to break, so as to ensure that the driver's vision is not affected.
6. Glass fiber laminated structure should be the best helmet material. Some foam cushioning materials of the helmet have low density, so it is necessary to choose a higher density, otherwise the helmet will lose its cushioning effect.