Bell MX-9 MIPS Fasthouse Helmet
Motocross Hero 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 we 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.
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Sizing Information
| Size | Head (inches) | Head (cm) | Hat Size |
| XS | 20 7/8 – 21 5/8 | 53-54cm | 6 5/8 – 6 3/4 |
| Small | 21 5/8 – 22 | 55-56cm | 6 7/8 – 7 |
| Medium | 22 1/2 – 22 3/4 | 57-58cm | 7 1/8 – 7 1/4 |
| Large | 22 3/4 – 23 1/4 | 59-60cm | 7 1/4 – 7 3/8 |
| XL | 23 5/8 – 24 | 61-62cm | 7 1/2 – 7 5/8 |
| XXL | 24 1/2 – 24 3/4 | 63-64cm | 7 3/4 – 7 7/8 |
| XXXL | 25 5/8 – 26 | 65-66cm | 8 1/8 – 8 1/4 |
This sizing chart is based on information provided to us by Bell Helmets and is subject to change without notice, although we will do our very best to keep it up to date. We recommend that you measure your head by wrapping a cloth tape measure around your head about 1 inch or 2.5 cm above your eyebrows, which should be the largest portion of your head. Choose the helmet that is closest to your measured head size. If you fall between two sizes, choose the smaller of the two. You want a helmet to fit snug without being uncomfortable.
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