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The Alpinestars SM3 Helmet Radium features a multi-density shell construction designed to provide optimal impact protection while maintaining a lightweight profile, making it ideal for motocross, enduro, and off-road riding. Its thermo-injected outer shell incorporates a durable polymer blend with varied thicknesses, engineered to absorb impacts efficiently without adding unnecessary weight. The impact-resistant thermoplastic exterior is complemented by an inner shell crafted from a composite fiber material situated between the outer shell and the EPS liner for enhanced impact absorption and structural integrity. This combination ensures superior protection during aggressive riding conditions while keeping rider comfort a priority.
The helmet's interior is equipped with a six-piece EPS liner featuring five different densities, strategically positioned to manage impact forces precisely where they occur. The polished inner EPS surface, coated to reduce friction, works in tandem with a comfort liner made from recycled materials, helping to minimize rotational impacts and reduce the overall carbon footprint. The helmet's interior fit can be customized with adjustable crown and cheek pads, providing a secure and comfortable fit tailored to each rider's head shape. Additionally, the helmet incorporates a low friction coating on the EPS liner to mitigate rotational acceleration forces, which can occur during oblique impacts, enhancing rider safety.
Ventilation is a key feature of the Alpinestars SM3 helmet, with ten intake ports and seven exhaust outlets facilitating maximum airflow and heat dissipation. The visor is engineered to channel air into these ports, further improving cooling and rider comfort. The visor release system is designed to detach with a controlled amount of force, reducing the risk of neck injuries during impacts. Practical features include integrated hydration tube channels in the cheek pads for convenience, a soft textile chin strap for optimal safety and comfort, and an emergency release system with removable cheek pads for easy, safe removal of the helmet if needed. The chin area is optimized for impact performance, while stainless steel D-rings ensure a secure fit, making this helmet a comprehensive choice for off-road enthusiasts seeking protection, performance, and comfort.
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