O'Neal - Sierra II Flat Helmet

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:

• Lightweight, balanced shell design

• Airflow channels for active cooling

• Moisture-wicking comfort liner

• Wide goggle port and adjustable peak

• Shell in constructed with ABS

• Weight: 1590g (± 50g)

• Moisture wicking, removable/washable air channeled comfort liner

• Vent holes for optimal ventilation

• Integrated face shield

• Height adjustable helmet shield

• Padded Chin Strap with Double-D safety lock

• Meets DOT and ECE 22.05 safety standards

• Designed for Street, Enduro, Side by Side and Adventure Bike’s

• Replacement parts available