MD-01 Volta Helmet
GMAX’s MD-01 Modular is the perfect helmet for cross-country adventures. With eleven vents and a COOLMAX® liner, you are sure to be comfortable even on the hottest of days. The... Read More
GMAX’s MD-01 Modular is the perfect helmet for cross-country adventures. With eleven vents and a COOLMAX® liner, you are sure to be comfortable even on the hottest of days. The integrated LED light helps to insure you are seen by traffic.
Features
- DOT Approved
- SpaSoft™ interior keeps you dry and comfortable. COOLMAX® CORE technology wicks moisture away from your body and dries quickly. Charcoal bamboo fiber keeps odor away by eliminating bacterial growth
- Removable, adjustable and washable SpaSoft™ interior allows for easy cleaning and custom fitting
- Drop down sun shade with anti-fog coating
- Integrated multi-function LED rear light included. (Optional wireless brake light kit available P/N 72-3781)
- Lightweight Poly Alloy shell. Large size only 4.1 lb
- Easy to use chin bar with push to open mechanism designed for one hand use with gloves
- UV400 100% protection face shield that comes anti-scratch hard coated for a longer lasting clear view
- Breath deflector and chin curtain included
- Built in speaker pockets
- Intercom compatible
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