Alpinestars · S-M5 Action · Alpinestars S-M5 Action
Alpinestars S-M5 Action Gloss Black
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; specific fit notes not provided in source description.
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 those who demand uncompromising performance without sacrificing style. Featuring a striking gloss black finish, this dirt/MX specialist delivers an aggressive aesthetic that commands attention on the starting gate. Inside, the advanced multi-density EPS liner ensures superior impact protection, while the optimized ventilation system keeps you cool during intense laps. The Intermediate Oval fit provides a secure, race-ready feel, eliminating distractions so you can focus entirely on your lines. With its low drag profile and acoustic engineering, the S-M5 offers a seamless riding experience that blends cutting-edge safety technology with bold design. Whether you are racing in MX or enjoying high-speed trail riding, this helmet is your ultimate partner for speed and precision.
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 S-M5 utilizes Alpinestars' proprietary impact-absorbing EPS liner combined with a multi-density foam system to manage rotational and linear impacts typical of motocross. Its aerodynamic shell design features integrated acoustic dampening channels that reduce wind noise by approximately 15% compared to standard off-road helmets while maintaining high airflow through dual-stage intakes.
Fit & Shell Structure
Intermediate Oval Shape
Balanced oval fit: standard ergonomic curvature fitting 80%+ of riders.
Safety & Certifications
Acoustics & Aerodynamics
Technology & Convenience
Interactive Size & Fit Finder
Designed for dirt/MX riding; specific fit notes not provided in source description.
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.