Alpinestars SM3 Radium Helmet ECE06/DOT

Alpinestars SM3 Radium Helmet ECE06/DOT

Thermo-injected polymer shell with variable thickness delivers exceptional impact protection while keeping the helmet lightweight at just 1430 g (ECE) and 1460 g (DOT). Ten intake vents and seven exhaust ports maximize airflow for superior heat transfer and all-day riding comfort. Patented low-friction liner coating reduces rotational forces on oblique impacts by mimicking the brain’s natural cerebrospinal fluid slip plane. Innovative visor release system deploys under predetermined force to reduce neck loads during an impact. Removable cheek pads, integrated hydration tube channels, and recycled comfort liner offer a customizable fit and eco-conscious performance in a DOT- and ECE 22.06-certified design. Meets Federal Motor Vehicle Safety Standard 218 (FMVSS 218). Engineered for MX, Enduro, and off-road riding, the SM3 Helmet integrates advanced technologies and innovations designed to enhance ease of use, comfort, and impact protection.