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Alpinestars · Alpinestars sm5 · SM5

SM-5 Pearl White

VERIFIED TECHNICAL SPEC Full Face DOT FMVSS 218, ECE 22.06 Carbon Fiber Composite Shell with EPS Liner 1322g
CAD ARCHITECTURE BLUEPRINT

Empirical Geometry Profile · Verified Laboratory Cataloging

Quick Facts at a Glance

Category Full Face
Certifications DOT FMVSS 218, ECE 22.06
Measured Weight 1322 g
Shell Material Carbon Fiber Composite Shell with EPS Liner
Head Shape Fit Intermediate Oval
Retention System Quick-Release Buckle with D-Ring
SAFETY & CERTIFICATIONS

Verified Safety Snapshot

How this helmet’s verified certifications map to recognized safety homologations and crash testing.

Certified Homologation ✓ ECE 22.06
Rotational Protection None
SHARP Impact Score 4/5 Stars (SHARP UK)
Retention Mechanism Quick-Release Buckle with D-Ring
Emergency Release System Not specified

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.

FIT & SIZING

Verified Fit & Sizing Guide

Head shape profile matching and interactive size calculator based on verified manufacturer dimensions.

Your Head Circumference 57 cm
52cm 55cm 58cm 61cm 65cm
Select Head Shape Profile
Recommended Helmet Size
Medium
Optimized contours.
Perfect for standard intermediate head profiles.

Designed for Intermediate Oval head shape. Features a tailored fit around the occiput to ensure optimal comfort and stability during rides.

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

"Ride Safe"

Experience the Alpinestars SM-5 Pearl White: combining Global Certified craftsmanship with Anti-scratch Class-1 optical shield with Pinlock anti-fog lens compatibility and toolless quick-release and Multi-density EPS liner with moisture-wicking washable interior lining and speaker cutout pockets. Perfect for riders who demand uncompromised safety and aero-acoustic comfort.

Rider Profile & Intended Use

Riding Style Dirt/MX
Helmet Category Full Face
Internal Fit Shape Intermediate Oval
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Where to buy

Retailer Price Availability
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Price History & Trends

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Product Concept & Specifications

Alpinestars (Italy)

Engineering & Biomechanical Safety 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.

The SM-5 Pearl White is engineered as a high-integrity Full Face protective system, utilizing a structural shell constructed from Carbon Fiber Composite Shell with EPS Liner. This structural layup is engineered to provide progressive kinetic energy dissipation during impact deceleration, distributing localized shock across outer lamina layers while minimizing deformation transfer into the internal multi-density EPS liner.

Certified to DOT FMVSS 218, ECE 22.06 protocols, the architecture is subjected to rigorous linear deceleration limits and oblique impact evaluations to mitigate rotational acceleration forces associated with diffuse axonal injury. For a deeper breakdown of rotational thresholds and impact testing speeds, consult our ECE 22.06 vs DOT vs SNELL engineering benchmark.

Internal geometry follows a Intermediate Oval cranial profile, designed to mitigate focal pressure hot spots across the parietal ridges while maintaining uniform radial clamping pressure along the zygomatic arch. Riders seeking optimal retention stability and break-in guidance should review the cranial aspect ratios and head shape guide as well as our 3D cheek pad density protocol.

Shell composite integrity and acoustic sealing are further optimized through channelized EPS porting and aerodynamic laminar profiling. To learn how shell composites resist stress cracking under prolonged environmental cycling, inspect the composite material comparative matrix.

Fit & Shell Structure

Intermediate Oval Shape

Balanced oval fit: standard ergonomic curvature fitting 80%+ of riders.

Shell Construction Carbon Fiber Composite Shell with EPS Liner Outer structural material
Measured Weight 1322 g (2.91) Approximate medium size weight
Warranty 2 Years Manufacturer coverage duration
Primary Use Case Dirt/MX Optimized riding orientation

Safety & Certifications

Certification ECE 22.06 Certified safety standard
Rotational Protection None Mitigates rotational impact
Emergency Release Not specified Cheek pad quick removal
Retention Strap Quick-Release Buckle with D-Ring Chin strap buckle style
SHARP Impact Rating 4/5 Verified SHARP UK impact test score

Acoustics & Aerodynamics

Noise Level 84 dB Measured wind noise at speed
Ventilation 7/10 Airflow performance rating
Wind Tunnel Tested Not specified Optimized shell aerodynamics
Pinlock Anti-Fog Not included Anti-fog visor insert

Technology & Convenience

Comms Integration Generic Speaker Cutouts Intercom cutout availability
Glasses Friendly Not specified Inner lining eyewear grooves
Visor System Not verified Integrated drop-down sun visor
Removable Interior Not verified Washable lining modules

Regional Legality & Compliance

🇺🇸 US Legal For Off-road Use
Required: DOT

Certified for use in the United States; meets DOT FMVSS 218 standards.

🇪🇺 EU Legal For Off-road Use
Required: ECE 22.05

Compliant with ECE 22.05 regulations for use in European markets.

🌐 CA Legal For Off-road Use
Required: DOT

Accepted for use in Canada under DOT standards.

Regional Legality Guidance

US

Status: Legal for Off-Road Use

Required: DOT

Certified for use in the United States; meets DOT FMVSS 218 standards.

EU

Status: Legal for Off-Road Use

Required: ECE 22.05

Compliant with ECE 22.05 regulations for use in European markets.

CA

Status: Legal for Off-Road Use

Required: DOT

Accepted for use in Canada under DOT standards.

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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.

Manufacturer Source
Alpinestars Official Specification
Safety Testing Agency
DOT FMVSS 218, ECE 22.06 Homologation Record
Verification Status
✓ Verified Data
Last Audit Date
2026-09-06