[Impact Resistance] - The innovative “in molding” technology which joins the high-density EPS foam and the tough PC shell to decrease the impact forces, ensures better shock absorption and give you full protection. The soft chin pad and removable inner padding can give you a comfortable journey in long time. [Magnetic Goggles] - Equipped with magnetic goggles for protecting your face from sun, wind and sand. And we use 3 in 1 design, it is easy to use and meets the needs of different scenarios. [Led Safety Light] - Built-in USB rechargeable led light can provide the highest possible protection and visibility on city roads. The light included 5 lighting modes which is unique in the market. What's more, the reflective strap also offer enough brightness, even you don't have to worry about safety when riding at night. [22 Large Vents ] - The 22 Large vents and a streamlined frame design to maximize airflow performance both inside and outside and reduce wind resistance. This highly ventilated design offers more airflow to keep you cool in your long journey. [Upgrade Adjustable System] - This mtb helmet used our upgrade adjustable dial fit retention system, which let you easily adjust helmet perfectly fit your head. The helmet's size is from 22 to 24 Inches.