Alpinestars SM3 Radium Helmet — Size M, Black, Gloss

Designed for aggressive trail and competition riding, this head protection balances comfort, usability and impact performance.

Thermo-injected shell construction features a special polymer blend with variable thickness, engineered to deliver an optimal combination of impact protection and low weight.

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

The visor release system is engineered to release at a predetermined force to help reduce neck loads during an impact.

Airflow and heat transfer are maximized with 10 inlets and 7 exhaust ports for effective ventilation.

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