MX-9 MIPS 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. The MX-9 Mips packs all these features into one helmet, delivering exceptional value and pro-caliber performance. MIPS-Equipped 3 Shell Sizes Typical offering requires additional padding sizes to accommodate all head sizes. Anti-Bacterial Liner Washable liner with quick-drying materials. Inhibits growth of odor-causing bacteria and fungi.