On-One Thunderdome MTB Helmet

Ride Hard. Stay Protected.

Engineered for riders who push the limits, the On-One Thunderdome delivers trail-ready protection with all-day comfort. Its rugged polycarbonate shell is fused to an EPS foam core for maximum impact absorption without adding unnecessary weight.

Strategically placed vents keep air flowing, so you stay cool on climbs and focused on descents. The extended rear coverage shields your head where it matters most, while the visor blocks sun and debris when the trail gets rowdy.

With its bold matte finish and unmistakable On-One graphics, the Thunderdome isn’t just another helmet — it’s a statement. Strap in, hit the dirt, and ride like you mean it.

• Lightweight, in-mold construction for superior protection
• 19 large vents for optimal airflow
• Extended rear coverage for added safety
• Visor for glare and debris protection
• Secure, dial-fit system for a snug, custom feel
• CE EN1078 

Take the trail by storm — gear up with the Thunderdome.