Alpinestars · S-M5 Action
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. Optimized for Intermediate Oval head shape.
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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The Alpinestars S-M5 Action delivers competition-grade off-road impact absorption with maximum cooling throughput, delivering lightweight balance and wide-vision goggle accommodation. Featuring a Advanced Multi-Composite (Carbon-Aramid-Glass / AIM+) architecture at 1444g, it combines progressive kinetic energy dissipation across DOT, ECE 22.06 certifications with an acoustically tuned ~100 dB aero profile. An ultra-breathable, antimicrobial interior liner stabilizes the helmet during aggressive terrain vibration, locked in securely with track-proven Double D-Ring retention.
Rider Profile & Intended Use
Where to buy
| Retailer | Price | Availability | |
|---|---|---|---|
| Amazon (US) | Check live price | View on site | Check Price → |
Price History & Trends
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Product Concept & Specifications
Alpinestars (Italy)Engineering & Technical Analysis
Features Advanced multi-composite aerodynamic shell geometry engineered for optimal impact absorption and stability paired with Anti-scratch Class-1 optical shield with Pinlock anti-fog lens compatibility and toolless quick-release. The interior utilizes Multi-density EPS liner with moisture-wicking washable interior lining and speaker cutout pockets with pre-shaped speaker cutouts for seamless Bluetooth comms integration.
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. Optimized for Intermediate Oval head shape.
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 / | — |
HSN-VAR-ALPINESTARS-S-M5-ACTION-GLOSS-BLACK | instock |
| Silver Metallic / | — |
HSN-VAR-ALPINESTARS-S-M5-ACTION-SILVER-METAL | instock |
| Hi-Viz Yellow / | — |
HSN-VAR-ALPINESTARS-S-M5-ACTION-HI-VIZ-YELLO | instock |
| Stripe TC-1 / | — |
HSN-VAR-ALPINESTARS-S-M5-ACTION-STRIPE-TC-1 | instock |
Available Colors & Graphics
View on retailers
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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.