AlpinestarsSm3 Radium Helmet Red

Varied thickness shell construction for optimized protection and light weight

Optimized for MX, Enduro, and Offroad use

Delivers blend of performance, protection, and comfort

Key Features

Features thermo-injected shell incorporating a polymer blend enhanced by varying degrees of thickness that is engineered to deliver the optimal combination of impact protection and light weight

Lightweight outer shell is constructed from impact resistant thermoplastic

Inner shell constructed with a composite fiber assembled between the outer shell and the EPS liner for maximum protection against impacts

Fit can be tailored to the rider's head thanks to the helmet's crown and cheek pads

Construction

Multiple density inner liner ensures the helmet is equipped with the correct density in the correct area for enhanced impact absorption, while also helping to reduce overall weight

6-piece EPS liner with five densities to effectively manage volume and impact performance

Polished inner EPS liner with special coating to reduce friction with comfort liner for rotational impact management

The inner and outer surfaces are engineered to minimize the effects of oblique impacts

Low friction coating is applied to the inner part of the main EPS liner to reduce the rotational acceleration forces that can result form certain oblique impacts

Maximized ventilation and high levels of heat transfer exchange thanks to ten inlets and seven exhaust ports

The visor has been designed to direct air into the ports for enhanced airflow

Visor release system ensures the visor is released with the correct pre-determined amount of force, effectively reducing the forces on the rider's neck during an impact

Comfort liner is constructed using recycled materials for a lower carbon footprint

Hydration tube channels are integrated into the helmet's cheek pads for convenience and performance

Soft textile chin strap is 25 mm for optimal safety and rider comfort

Protection

Equipped with an Emergency Release System and removable cheek pads to permit the safe and easy removal of the cheek pads while the helmet is still on, while the 3D contoured foam ensures rider comfort

Chin area optimized for superior impact performance

Stainless steel D-rings ensure a tight and secure fit

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