O'Neal Adventure Helmet
O'Neal ON25H0818-52
O'Neal Sierra Flat V23 Adventure Helmet - Black
R3,190.00
PRODUCT INFO
Whether you ride on the pavement or the dirt or both the Sierra II has the features you need for your next two-wheel adventure. Combining a full windscreen and a visor with a drop-down tinted shield, the Sierra II helmet will get you anywhere you want to go.
Features
- Shell is constructed with ABS
- Weight: 1590g (±50g)
- Moisture-wicking, removable/washable air channeled comfort liner
- Vent holes for optimal ventilation
- Integrated face shield with UV protection
- Height adjustable helmet shield
- Padded Chin Strap with Double-D safety lock
- Meets DOT and ECE 22.05 safety standards
- Designed for Street, Enduro and Adventure Bikes
- Replacement parts available
- Side goggle traction pad keeps goggle strap securely in place
- High air intake mouth vent with screen lets air in while keeping debris out
Sizing
To determine which helmet size fits you best, measure the widest circumference of your head using a flexible measuring tape or piece of string; approximately 2cm above your eyebrows and ears as illustrated below. If your head measurement falls between two sizes, it is generally recommended to select the smaller of the two.

For maximum safety and comfort, take note of the following points when fitting the helmet (and securely fastening the chin strap):
- Helmet may take some effort to slide over your head, but should not be overly difficult
- Should fit snuggly around the crown of your head without creating uncomfortable pressure points
- The top padding presses on the top of your head
- The cheek pads press against your cheeks, so that your teeth touch the inside of your cheeks when opening / closing your mouth
- There should be no space to slide two fingers between the helmet and your temple
- Hold the helmet on either side and without moving your head, try to move the helmet up and down, and side to side. It should not be easy to move and you should feel the skin of your head and face being pulled
- Your eyes should be located in the center of the helmet's viewpoint
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