Description
O’Neal – Sierra II Flat Helmet
The O’Neal Sierra II Flat Helmet feels like that dependable lid you grab every weekend, light, well-vented, and ready for whatever track or trail you throw at it.
Balanced shell weight, efficient venting, and a plush liner that keeps its shape moto after moto.
Why We Like It:
Everything about it feels dialed: airflow, comfort, and control without unnecessary extras.
Why It’ll Work for You:
If you want straightforward performance, easy goggle fit, and comfort that holds up, this helmet just works.
Variants / Options:
Available in several colorways and sizes for a dialed-in fit.
Key Features:
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Lightweight, balanced shell design
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Airflow channels for active cooling
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Moisture-wicking comfort liner
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Wide goggle port and adjustable peak
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Shell in constructed with ABS
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Weight: 1590g (± 50g)
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Moisture wicking, removable/washable air channeled comfort liner
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Vent holes for optimal ventilation
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Integrated face shield
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Height adjustable helmet shield
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Padded Chin Strap with Double-D safety lock
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Meets DOT and ECE 22.05 safety standards
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Designed for Street, Enduro, Side by Side and Adventure Bike’s
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Replacement parts available
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