The all new Oneal MX Sierra Dual Sport Helmet for Adults. Look good out on the track today.
FEATURES
Aerodynamic and lightweight shell construction
Meets or exceeds DOT/ECE/AS safety standards
Adjustable mouth, brow and rear vents for a controlled airflow with a total of 17 air vents for a maximum cooling effect
Integrated flip-down inner sun visor
Shield can be removed to allow open face riding or goggle use
Removable and washable comfort liner and cheek pads
| Size | Inches | CM |
| XS | 20.5-21.5" | 54 |
| S | 21.5-22.5" | 56 |
| M | 22.5-23.5" | 58 |
| L | 23.5-23.5" | 60 |
| XL | 23.5-24.5" | 62 |
| XXL | 24.5-25.5" | 64 |