Alpinestars Motocross Helmets

Engineered for motocross, enduro, and off-road riding, the Alpinestars SM3 Helmet combines cutting-edge safety technologies with premium comfort and design. Every element is built to enhance rider protection, ventilation, and ease of use — all while maintaining a lightweight feel.

This next-generation helmet delivers superior impact absorption, advanced rotational acceleration force protection, and an optimized ventilation system to keep riders cool and confident in any terrain.

Key Features:

• Advanced Shell Construction – thermo-injected polymer shell with varying thickness for the perfect balance of lightweight strength and impact protection
• Optimised Ventilation – 10 air inlets and 7 exhaust ports for maximum airflow and efficient heat exchange.
• Rotational Force Protection – patented low-friction EPS liner coating reduces rotational acceleration from oblique impacts, mimicking the brain’s natural protection.
• Patented Visor Release System – designed to release at a precise force level to reduce neck strain during impact.
• Multi-Density EPS Liner – 5 inner parts with 4 densities for controlled impact management.
• Hydration Compatibility – integrated hydration tube channels within cheek pads.
• Eco-Conscious Comfort Liner – made using recycled materials for reduced environmental impact.
• Customisable Fit – replaceable crown and cheek pads available in multiple thicknesses.
• Enhanced Chin Protection – optimized shell thickness and structure exceed standard homologation tests.
• Emergency Release System – allows safe removal of cheek pads while the helmet remains on.
• Secure Fastening – 25mm soft chin strap with stainless steel D-rings for safety and comfort.
• Global Certification – conforms to DOT and ECE 22.06 standards.

The Alpinestars SM3 Helmet delivers class-leading safety, comfort, and ventilation — the ultimate choice for serious off-road riders.

Sizing

To determine which helmet size fits you best, measure the widest circumference of your head using a flexible measuring tape or piece of string; approximately 2cm above your eyebrows and ears as illustrated below. If your head measurement falls between two sizes, it is generally recommended to select the smaller of the two.

For maximum safety and comfort, take note of the following points when fitting the helmet (and securely fastening the chin strap):

• Helmet may take some effort to slide over your head, but should not be overly difficult
• Should fit snuggly around the crown of your head without creating uncomfortable pressure points
• The top padding presses on the top of your head
• The cheek pads press against your cheeks, so that your teeth touch the inside of your cheeks when opening / closing your mouth
• There should be no space to slide two fingers between the helmet and your temple
• Hold the helmet on either side and without moving your head, try to move the helmet up and down, and side to side. It should not be easy to move and you should feel the skin of your head and face being pulled
• Your eyes should be located in the center of the helmet's viewpoint