Alpinestars Motocross Helmets

The Alpinestars SM3 Heat MX Helmet delivers next-generation protection for serious off-road riders. It combines superior impact absorption, rotational force protection, and an optimised ventilation system, keeping riders cool and confident across any terrain.

To enhance safety, the thermo-injected polymer shell features varying thickness for a perfect balance of lightweight strength and impact resistance. Meanwhile, the multi-density EPS liner, made with five sections and four densities, manages impacts with precision. Additionally, the patented low-friction EPS coating reduces rotational acceleration from oblique impacts, mimicking the brain’s natural protection.

Comfort and fit are also priorities. The eco-conscious liner uses recycled materials and wicks moisture efficiently. At the same time, replaceable crown and cheek pads allow a customisable fit. Integrated hydration tube channels make it easy to stay hydrated during long rides. Furthermore, the patented visor release system reduces neck strain during impacts, while enhanced chin protection exceeds standard homologation tests.

Practical safety features round out the helmet. The emergency-release system allows safe removal of cheek pads without taking the helmet off. The 25mm soft chin strap with stainless steel D-rings keeps the helmet secure and comfortable. Moreover, it meets DOT and ECE 22.06 global certification standards for maximum peace of mind.

Key Features

• Advanced Shell Construction – thermo-injected polymer shell for lightweight strength
• Optimised Ventilation – 10 air inlets, 7 exhaust ports
• Rotational Force Protection – low-friction EPS coating
• Patented Visor Release System – reduces neck strain
• Multi-Density EPS Liner – 5 inner parts with 4 densities
• Hydration Compatibility – integrated cheek pad channels
• Eco-Conscious Comfort Liner – recycled materials
• Customisable Fit – replaceable crown and cheek pads
• Enhanced Chin Protection – exceeds homologation standards
• Emergency Release System – safe cheek pad removal
• Secure Fastening – 25mm soft chin strap with stainless steel D-rings
• Global Certification – DOT and ECE 22.06

Overall, the Alpinestars SM3 Heat MX Helmet delivers class-leading safety, comfort, and ventilation. Therefore, it’s the ultimate choice for off-road riders who demand performance and protection in every ride.

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