MX-46Y Unstable Helmet
The MX-46Y is one of the lightest DOT youth helmets on the market at just 2.2 lbs. With the one shell in youth it can be custom fitted all the... Read More
The MX-46Y is one of the lightest DOT youth helmets on the market at just 2.2 lbs. With the one shell in youth it can be custom fitted all the way from youth small to youth large. This way the helmet can grow as they do. The 19 vents create maximum airflow keeping you cool and comfortable lap after lap.
Features
- DOT Approved
- One shell can be adjusted to three different sizes so the helmet can grow as your child grows
- Maximum air flow is achieved through industry leading 19 vents
- Removable, adjustable, washable interior allows for easy cleaning and custom fitting
- High flow, removable mouth vent with washable filter
- Vented roost deflector
- Fully adjustable, flexible and vented visor designed for maximum vision and protection
- Lightweight Shell. Youth only 2.2 lbs.
- Optional cold weather breath guard is available P/N - 72-3407
How to measure
Measure the circumference of your head one inch above the eyebrows and across the largest portion of the back of the head, then find the matching range. The crown should apply snug, even pressure and cheek pads should be snug (they break in with use). If the helmet moves on your head it is too loose; if it causes pain it is too small. If between sizes, size down.
GMAX size chart
| Size | Head circumference (cm) | Head circumference (inches) |
|---|---|---|
| YL / XS | 53-54 | 20 7/8 - 21 1/4 |
| S | 55-56 | 21 5/8 - 22 |
| M | 57-58 | 22 7/16 - 22 13/16 |
| L | 59-60 | 23 1/4 - 23 5/8 |
| XL | 61-62 | 24 - 24 3/8 |
| 2XL | 63-64 | 24 13/16 - 25 |
| 3XL | 65-66 | 25 5/8 - 26 |
| 4XL | 67-68 | 26 3/8 - 26 3/4 |
Youth sizes
| Size | Head circumference (cm) | Head circumference (inches) |
|---|---|---|
| YS | 49-50 | 19 5/16 - 19 11/16 |
| YM (= XXS) | 51-52 | 20 1/16 - 20 7/16 |
| YL (= XS) | 53-54 | 20 7/8 - 21 1/4 |
One universal GMAX chart covers the whole lineup (street, dual-sport, snow). Youth and adult small sizes share shells and are dual-labeled: a Youth Large is the same fit as an adult XS.
Manufacturer sizing data · verified July 8, 2026