Alpinestars SM3 Radium Helmet — Size S, Black

🪖 Engineered for MX, enduro and off-road use, this helmet prioritizes ease of use, comfort and impact performance.

Thermo-injected shell construction uses a specialized polymer blend with variable thickness to deliver a balanced combination of protection and low weight.

A patented low-friction coating is applied to the inner EPS liner to reduce rotational acceleration from oblique impacts, creating a controlled slip plane similar to the brain's natural cerebrospinal fluid.

The visor features a patented release system that releases at a predetermined force to help reduce neck loads during impacts.

Ventilation is maximized through a network of 10 inlets and 7 exhaust ports to improve heat transfer and rider comfort.

Advanced foams and engineered polymers are integrated to manage energy and durability across a variety of off-road conditions.