BELL MX-9 Mips Alterego Red Full Face Helmet The off-road world is unforgiving and rugged. Chunks of rock and dirt mean serious business when propelled by spinning tires, and even in muddy conditions, impact is always harsh. The MX-9 Mips consolidates all of these features into one helmet, offering exceptional value and pro-level performance. Safety features The MX-9 is a great offroad helmet by Bell for Motocross/Enduro riders. These helmets are specially designed to give you the best experience when causing havoc in the dirt. The polycarbonate shell is durable and provides rugged protection against the rough conditions of off-road terrain.