Alpinestars · S-M5 Action
Alpinestars S-M5 Action
Quick Facts at a Glance
Verified Safety Snapshot
How this helmet’s verified certifications map to recognized safety homologations and crash testing.
Safety standards compliance is based on official manufacturer documentation and public safety laboratory test results. Always verify regional compliance labels on the physical helmet prior to use.
Verified Fit & Sizing Guide
Head shape profile matching and interactive size calculator based on verified manufacturer dimensions.
Designed for dirt/MX riding; Alpinestars S-M5 Action features a multi-density EPS liner and extended coverage for off-road use.
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, and repeat for consistency.
Design Concept & Background
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Dominate the track with the Alpinestars S-M5 Action, a helmet engineered for riders who demand uncompromising performance and style. Featuring an aggressive aerodynamic profile, this dirt bike helmet slices through the air to reduce drag while maintaining superior acoustic comfort at high speeds. The interior is crafted from premium moisture-wicking materials that keep you cool and dry, regardless of how intense the heat becomes on the trail. With its sleek, modern graphics and robust construction, the S-M5 Action isn't just protective gear; it's a statement of your riding identity. Experience the perfect balance of safety, ventilation, and aerodynamics in a helmet designed for the ultimate MX experience.
Rider Profile & Intended Use
Where to buy
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Amazon (US)
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Price History & Trends
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Product Concept & Specifications
Alpinestars (Italy)Engineering & Technical Analysis
The Alpinestars S-M5 Action utilizes a multi-density EPS liner and an advanced retention system to ensure precise head retention during aggressive motocross maneuvers. Its aerodynamic shell design minimizes wind turbulence while the integrated sun visor and acoustic foam strategically dampen high-frequency noise without compromising breathability.
Fit & Shell Structure
Intermediate Oval Shape
Balanced oval fit: standard ergonomic curvature fitting 80%+ of riders.
Safety & Certifications
Acoustics & Aerodynamics
Technology & Convenience
Regional Legality & Compliance
Compliant with FMVSS 218 standards for off-road and street use where applicable.
Meets current ECE 22.06 safety regulations for motorcycle use.
Regional Legality Guidance
Interactive Size & Fit Finder
Designed for dirt/MX riding; Alpinestars S-M5 Action features a multi-density EPS liner and extended coverage for off-road use.
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, and repeat for consistency.
Part numbers
| Product style | MFR. product # | SKU | Availability |
|---|---|---|---|
| Gloss Black / | — |
ALP-SM5A-BLK | instock |
| Silver Metallic / | — |
ALP-SM5A-GRE | instock |
| Hi-Viz Yellow / | — |
ALP-SM5A-YEL | instock |
| Stripe TC-1 / | — |
ALP-SM5A-STR | instock |
Available Colors & Graphics
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Data Confidence & Verification Provenance
Helmetsan enforces field-level verification and multi-source cross-referencing. Unverified values are explicitly flagged rather than estimated.