Alpinestars SM5 Sail Motorcycle Helmets

The Alpinestars SM5 is the result of over five years of intensive study, development, and testing. It was designed to provide MX riders with a helmet that is purposefully engineered to deliver the ultimate balance of impact protection, lightweight performance, and superior comfort.

High-Tech Thermo-Injected Shell ✅

Advanced Polymer Blend: Features a thermo-injected shell with varying degrees of thickness to optimize impact resistance and weight.
5-Density EPS Liner: Ensures the correct density is applied to the correct area for enhanced energy absorption across the entire helmet.
Anatomical Sizing: Constructed with 3 unique shell sizes and 3 individual EPS inner liner sizes to provide 6 unique fitment options for maximum safety.
Lightweight Performance: The ECE-certified version weighs only 1,350 grams (Size Medium), reducing neck fatigue during long motos.

Revolutionary Safety & Protection ✅

Collarbone Protection: Features an engineered raised area with padding to significantly reduce forces transmitted to the collarbone during a crash.
Patented Visor Release System: Ensures the visor releases with a pre-determined amount of force, regardless of the impact angle, preventing additional rotational stress.
Oblique Impact Mitigation: The inner and outer surfaces are engineered to minimize the effects of angled impacts.
Rotational Force Management: Utilizes a proprietary low-friction surface on the inner EPS liner to fight and mitigate rotational impact forces.

Next-Gen ECE 22.06 Performance ✅

Superior Impact Rating: Achieves a 44% better regular-speed impact rating compared to previous standards.
Multi-Speed Safety: Surpasses standard linear impact scores by 32% (low-speed) and 31% (high-speed).
Rotational Oblique Performance: Under the new ECE 22.06 regulations, the SM5 scores an impressive 70% under the regulation limits.

Optimal Ventilation & Ergonomics ✅

Maximized Airflow: Multiple air inlets and exhaust ports provide high levels of heat transfer for all-day cooling.
Aero-Optimized Visor: The visor is specifically designed to direct air into the intake ports for enhanced ventilation.
Wider Lower Volume: The lower shell volume (Sizes M to 2XL) has been revised to be 3% wider, making the helmet significantly easier to put on and take off.
Sculpted Chin Bar: The base area is sculpted to provide a relief section, raised to clear the collarbone for improved rider mobility.

Technical Specifications ✅

Certification: Conforms to ECE R 22.06.
Weight: 1,350g (Size M).
Shell Material: Impact-resistant Thermoplastic.

Helmet Size Chart

Size	Circumference (CM)	Circumference (IN)	Hat Size (IN)
XS	53–54	20 7/8 – 21 1/4	6 5/8 – 6 3/4
S	55–56	21 5/8–22	6 7/8–7
M	57–58	22 1/2–22 3/4	7 1/8–7 1/4
L	59–60	23 1/8– 23 1/2	7 3/8–7 1/2
XL	61–62	23 7/8–24 1/4	7 5/8–7 3/4
XXL	63–64	24 5/8–25	7 7/8–8

Alpinestars Helmets

Filters

Alpinestars SM5 Sail Motorcycle Helmets

Compare products