Alpinestars S-M3 Radium Helmet - Gray/Black/Yellow Fluoro
Alpinestars S-M3 Radium Helmet - Gray/Black/Yellow Fluoro
SKU: AS-8300726-9510-XS
Alpinestars Helmet Sizing
| Size | Head (cm) |
|---|---|
| XS | 53-54 |
| S | 55-56 |
| M | 57-58 |
| L | 59-60 |
| XL | 61-62 |
| XXL | 63-64 |
How to Measure
Wrap a cloth measuring tape around your head just above your eyebrows and ears. Pull the tape comfortably snug, read the length, repeat for good measure and use the largest measurement.
In stock online
DR MOTO Tauranga: Not in store
Out of stock online
DR MOTO Tauranga: Not in store
Out of stock online
DR MOTO Tauranga: Not in store
Out of stock online
DR MOTO Tauranga: Not in store
In stock online
DR MOTO Tauranga: Not in store
In stock online
DR MOTO Tauranga: Not in store
SHIPPING
SHIPPING
Shipping – New Zealand
Orders may be dispatched from our warehouses across New Zealand. Where possible, we’ll ship from the closest location with stock available.
Free shipping on orders over $199.
Excludes motorcycles, ATVs, electric bikes, tyres, bulky items and dangerous goods.
Most orders arrive within 1–3 business days. Please allow additional time for rural delivery.
We can also deliver to your workplace.
RETURNS
RETURNS
**Please choose carefully - no refunds or exchanges on clearance items.**
If you are unsure about fitment or sizing, please contact us first.
Any goods purchased from DR MOTO can be returned within 14 days of receipt for refund or exchange less any freight expenses and the order meets our explicit terms and conditions.
The goods must be returned new, unused, unaltered, not previously installed, and in a sellable condition with all of the original packaging.
This right of return will not cover items that are special orders and found to be an incorrect fit, this is the responsibility of the purchaser, however all other standard warranties will apply.
Freight costs will not be refunded.
Please refer to our returns policy for full terms & conditions.
FITMENT GUIDE
FITMENT GUIDE
For direct bike fitment please use our SEEKER PARTS FINDER
For clothing fitment and product information guide CLICK HERE
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Alpinestars S-M3 Radium Helmet - Gray/Black/Yellow Fluoro
Purpose-built for motocross, enduro, and off-road riding, the Alpinestars SM3 Helmet combines advanced protection, comfort, and ventilation in a lightweight, feature-packed design. Engineered using Alpinestars’ extensive research and in-house safety standards, the SM3 delivers exceptional impact absorption, rotational protection, and rider comfort — all in one high-performance helmet.
Advanced Shell Construction
- Thermo-Injected Polymer Shell: Crafted from a specially formulated polymer blend with variable thicknesses to optimise impact protection and weight reduction.
- Lightweight Performance: Weighs just 1430g (ECE, Size M) for reduced rider fatigue without compromising safety.
- Enhanced Structural Integrity: Reinforced chin area meets Alpinestars’ own internal safety standard, exceeding standard homologation requirements for superior impact performance.
Impact & Rotational Protection
- Multi-Density EPS Liner: Features five EPS sections with four density zones to provide precise energy absorption across varying levels of impact force.
- Patented Low-Friction Coating: Applied to the inner EPS liner, this innovative layer is designed to mimic the natural movement of the brain’s cerebrospinal fluid, helping to reduce rotational acceleration forces generated by oblique impacts.
- Optimised Inner & Outer Surfaces: Engineered to minimise rotational effects and help redirect impact energy away from the rider’s head.
Patented Safety Systems
- Visor Release System: The visor is designed to automatically detach at a pre-determined force, helping to reduce loads transferred to the neck during an impact, regardless of impact direction.
- Emergency Release System: Allows the cheek pads to be safely and easily removed while the helmet remains on the rider.
Ventilation & Comfort
- 17-Port Ventilation System: Ten intake vents and seven exhaust vents maximise airflow and heat dissipation during demanding riding conditions.
- Recycled Comfort Liner: Removable and washable liner constructed from recycled materials for improved moisture management and a reduced environmental footprint.
- 3D Contoured Foam Padding: Provides excellent comfort, pressure relief, and a secure fit throughout long riding sessions.
- Hydration System Ready: Integrated cheek pad channels allow easy installation of a hydration tube, making the SM3 ideal for endurance, enduro, and rally riding.
Fit & Convenience
- Customisable Interior Fit: Crown and cheek pads are available in multiple thickness options, allowing riders to fine-tune the helmet for a more precise and comfortable fit.
- Soft 25mm Chin Strap: Designed to provide excellent comfort while maintaining secure helmet retention.
- Stainless Steel D-Rings: Deliver a strong, reliable, and secure fastening system in all riding conditions.
Certifications
- ECE 22.06 approved.
- DOT approved.
- Designed to meet the latest requirements for impact protection and rotational performance.
The Alpinestars SM3 Helmet represents the next evolution in off-road protection — lightweight, aerodynamic, highly ventilated, and engineered for riders who demand uncompromising safety and all-day comfort across motocross tracks, trails, and demanding off-road terrain.