♥ Friendly tip: It is very dangerous to ride without a motorcycle helmet. It also violates traffic rules. To better meet your shopping needs, measure your actual head circumference value before purchasing. Returning will waste your precious time.1. The air circulation in the ventilation system keeps the driver cool and comfortable.2. High-strength ABS shell, Multi-density EPS safety buffer layer can provide the most advanced energy absorbing capacity.3. Thickened and hardened high-definition anti-fog double lenses so you can see more clearly4. PC sun visor, anti-fog, rainproof, high definition ultraviolet rays.5. High quality inner lining, sweat-absorbing, removable, won't get boring after long wear.6. Certification: ECE 22.05 / DOTFMVSS-218 certificationMaterial type: flip-up helmet with two lensesProduct weight: 1800GSize: M = (57 ~ 58CM), L = (59 ~ 60CM), XL = (61 ~ 62CM), 2XL (63 ~ 64CM)Certification: DOT / ECE certificationCustomer service:★ If you have any questions or dissatisfaction with the product, please contact us and let us perfectly solve this problem through friendly communication.