High Quality & DOT Approved MXJ Gear motorcycle helmets meets DOT & FMVSS 218 safety standards. And Our full face helmet adopts Lightweight ABS shell, breathable and comfortable EPS lining Material, It brings high-strength protection and excellent pressure-resistant buffer performance. Full Face Motorcycle Helmet Sizes Our adult helmet motorcycle are available in 5 sizes for you to choose from, they are S/M/L/XL/XXL. NOTE!!!: Please measure your head circumference and then choose the right size according to the size chart. If you have slightly chubby cheeks, we recommend choosing a larger size. Ventilation & Heat Dissipation Our full face motorcycle helmet has multiple well-designed vents on the top, front and back of the helmet, which can promote air circulation and provide optimal ventilation and heat dissipation, which can promote air circulation and keep your head cool and comfortable during long rides, suitable for any summer or winter riding environment.