The Bell MX-9 blends the best of their dirt and street knowledge to produce a feature-packed go-anywhere, do-anything helmet. The lightweight polycarbonate shell comes in three different sizes, and the velocity-flow ventilation system provides excellent airflow throughout the helmet. A removable and washable liner ensures you can keep sweat and bacteria build-up at bay. In the event of an accident where your head is subjected to impact at an angle, the MIPS dramatically improves displacement of the rotational impact energy.