


🏍️ Gear up in style and safety — the Sierra Helmet means business!
The O'NEALSierra Helmet combines a durable ABS hard shell with a lightweight design (1590g ±50g) and advanced ventilation features, including a high air intake mouth vent with debris screen. Certified DOT for safety, it offers a moisture-wicking, removable liner and a secure double-D chin strap, making it the perfect full-face helmet for serious riders seeking comfort, protection, and style.






| Sport | Motorcycling |
| Certificate type | DOT |
| Finish type | Glossy |
| Shell type | Hard |
| Shape | Aerodynamic |
| Closure type | Buckle |
| Global Trade Identification Number | 04046068488004 |
| Manufacturer | O'Neal |
| Model name | Sierra II |
| Age Range | Adult |
| Color | Flat Black |
| Size | XL |
| Style | full-face-helmet-style |
| Weight | 2040 Grams |
| Material Type | Composite |
| Number of Items | 1 |
| Outer Material | Acrylonitrile Butadiene Styrene (ABS) |
| Features | Adjustable |
| Included Components | helmet |
| Batteries Included? | No |
| Department | unisex-adult |
| Item model number | 0817-505 |
| Product Dimensions | 40.64 x 2.54 x 30.48 cm; 1.59 kg |
| ASIN | B01K9GN7FE |
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