Alpinestars SM3 Radium Motocross Helmet
- ECE 22.06 and DOT certified, meets FMVSS 218
- 1430 g (ECE) or 1460 g (DOT) listed weight
- Ten intake vents, seven exhaust ports
- Double ring closure
- Breakaway visor release under a set impact force
- Low-friction liner coating to reduce rotational forces
Updated 21 days ago · Based on the Amazon listing and published specifications, not hands-on testing.
A well-equipped off-road helmet for motocross and enduro riders who want rotational impact protection and a breakaway visor. The listing does not state the size, so confirm it before ordering.
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ASIN: B0FF3VHXFQModel: SM3Category: Motorcycle Helmets
Sizes Available
Colors Available
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Overview
Motocross and enduro riders get an off-road helmet with a polymer shell of varying thickness and a low-friction liner coating meant to cut rotational forces in angled impacts. The visor releases under a set force, and built-in channels route a hydration tube.
Rotational impact management and a visor built to break away put the focus on crash safety, while both DOT and ECE certification apply. Sizing is not stated in the listing text and the specs disagree on weight, so confirm the size before ordering.
Who it's for
Off-road riders doing long, hot motos or enduro loops who carry a hydration pack and want strong airflow. Street commuters should look elsewhere, since no face shield is listed.
Pros and cons
- Low-friction liner targets rotational impacts
- Breakaway visor reduces neck loads
- High vent count for airflow
- Removable cheek pads
- Size not stated in the listing
- Specs and bullets disagree on weight
- 30-day exchange policy, no warranty term
Performance notes
Cooling comes from the intake and exhaust vents moving air through the shell, which matters most on slow, hot enduro sections. In a crash, the variable-thickness shell spreads the impact and the low-friction liner coating lets the head slip slightly to reduce rotational force, while the visor release limits the twisting load a snagged visor can put on the neck.
Specifications
| Brand | Alpinestars |
|---|---|
| Model | SM3 |
| Dimensions & fit | |
| Item weight | 3.15 pounds |
| Construction & materials | |
| Shell Type | Thermo-injected polymer, variable thickness |
| Color | Black/White/Gray Glossy |
| Material Type | ABS Shell, EPS Liner |
| Compatibility & installation | |
| Hydration compatible | Integrated hydration tube channels |
| Warranty & support | |
| Warranty Description | 30 days |
| Other details | |
| Closure Type | Double Ring |
| Shape | Oval |
| Number Of Vents | Ten intake, seven exhaust |
| Sport Type | Motocross, Enduro, Off-Road |
| Specification Met | DOT, ECE 22.06, FMVSS 218 |
| Liner | Removable cheek pads, recycled comfort liner |
Frequently asked questions
How do I adjust the fit of the Alpinestars SM3 Radium?
The cheek pads are removable, which allows the fit to be tuned, and the closure is a double ring strap. The listing gives no pad sizes or fitting guide.
Does the Alpinestars SM3 have a face shield?
No face shield is listed. It is an off-road helmet for MX, enduro and off-road riding, with a visor that releases under impact force.
Can I use a hydration pack with the SM3 Radium?
Yes, the helmet has integrated hydration tube channels for a drinking tube.