Alpinestars SM3 Radium Helmet — XL, Gray

This helmet is engineered for MX, Enduro and off-road use, featuring innovations and technologies optimized for ease of use, comfort and impact performance.

Shell construction uses a thermo-injected design with a special polymer blend and varying thicknesses to deliver an optimal combination of impact protection and light weight.

A patented low-friction coating on the inner EPS liner reduces rotational acceleration forces from oblique impacts, acting as a slip plane similar to the brain's cerebrospinal fluid.

A patented visor-release system ensures the visor releases at a pre-determined force, helping to reduce forces on the neck during an impact.

Ventilation is maximized with ten inlets and seven exhaust ports to promote airflow and efficient heat transfer.

Material composition: 48% Acrylonitrile-Butadiene-Styrene, 20% Polyurethane, 16% Polystyrene (EPS), 6% Polypropylene, 4% Polyvinyl Chloride, 2% Ethylene-Vinyl Acetate, 2% Steel, 1% Expanded Polypropylene, 1% Polyamide.