Advice & Guides Advice: How to make sure your helmet fits correctly
You'd be surprised how many riders wear a helmet that's too big for them. Here's how to tell if a lid really fits you...
1 Feb 2022
O'Neal Sierra RS - Echo Black / Neon Yellow
Lightweight ABS adventure helmet with optimal ventilation, removable interior and integrated sun visor
Details£133.32
RRP £159.99 - save £26.67
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Verified Customer Reviews for O'Neal Sierra RS
Awesome Helmet 
07 Aug 2026 by Rachael
Nice, snug fit - everything feels secure. Good padding. Great ventilation & noise reduction. Easy functioning (strap, visors etc) Overall, a fantastic , nice-looking, high quality helmet & great value.
Style: Solid Black
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Great helmet
26 Jul 2026 by Anonymous
I’m quite pleased with this helmet. Has good ventilation, wind resistance, intercom space, and it’s comfortable.
The sizing is accurate.
Style: Solid Black
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Description
Product Specification
Variants
Manufacturer
O'Neal Sierra RS - Echo Black / Neon Yellow
- High-quality ABS shell construction
- Optimal ventilation and cooling provided by 10 in and 8 outlet vents
- Secure Microlock closure system
- Removable, sweat-absorbing, and washable padded comfort liner enhances comfort
- Bluetooth-ready with internal speaker cavities (Bluetooth unit not included)
- Includes Pinlock® 30 fog-resistant insert lens
- Features a clear visor with a secondary integrated sun visor
- Ready for Quin Smart Safety Sensor Installation
- Emergency Quick Release Pads allows the helmet to be removed without compromising the neck
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