Alpinestars · S-M5 Action · Alpinestars S-M5 Action
Alpinestars S-M5 Action Hi-Viz Yellow
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 with high-visibility yellow color; specific fit details vary by head shape and size selection.
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 and trail with the Alpinestars S-M5 Action in striking Hi-Viz Yellow. Engineered for serious MX riders who demand uncompromising safety without sacrificing style, this helmet features a sleek, aggressive profile that cuts through the air with minimal drag. The advanced composite shell is reinforced with high-impact materials to withstand the rigors of motocross racing, while the integrated MIPS system provides an extra layer of rotational protection in critical moments. Experience superior breathability through strategically placed vents that channel airflow efficiently, keeping you cool during intense laps. The interior padding offers a custom-molded feel for maximum comfort, ensuring focus remains on the ride. With its bold colorway and premium construction, the S-M5 Action is not just protective gear; it is a statement of performance and precision engineering designed to keep you safe while looking unstoppable.
Rider Profile & Intended Use
Where to buy
Price History & Trends
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Product Concept & Specifications
Alpinestars (Italy)Engineering & Technical Analysis
The S-M5 Action utilizes Alpinestars' proprietary Multi-Directional Impact Protection System (MIPS) integrated within a lightweight composite shell to mitigate rotational forces during off-road impacts. Its aggressive aerodynamic contouring reduces wind buffeting at high speeds, while the extensive venting network ensures thermal regulation without compromising structural rigidity.
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 with high-visibility yellow color; specific fit details vary by head shape and size selection.
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.
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.