The off-road world is a dirty, tough place. Chunks of rock and dirt mean business when launched by roosting tires, and even when it s muddy, hitting the ground is always hard. That s why Bell sweated the details on the MX-9, loading it with a tough polycarbonate shell, MIPS energy management system, an adjustable visor, Velocity Flow ventilation, and a removable, washable, anti-microbial liner for when the time comes to hose down. The MX-9 MIPS packs all these features into one helmet, delivering exceptional value and pro-caliber performance. 1.5 kg MIPS Multi-Directional Impact Protection System MIPS (Multidirectional Impact Protection System) is an industry-leading anti-friction surface technology in the helmet, designed to reduce rotational forces generated by certain impacts. Velocity Flow Ventilation Bell s Velocity Flow Ventilation System literally pulls air through the helmet, keeping the rider cooler.