The Alpinestars S-M5 Motocross helmet is a lightweight off-road helmet with a technologically advanced impact-resistant thermoplastic shell developed in two shell sizes for added aerodynamics and comfort on the bike. The multiple-density inner liner ensures the correct density in the right area for optimum impact absorption. At the same time, the soft EPS foam prevents damage to the collarbone in the event of a crash. Off-road riding can be hard work, but the Alpinestars S-M5 helmet has a complete ventilation system with high levels of heat transfer exchange with multi-air inlets and exhaust ports with airports on the visor to funnel the air through. Inside the S-M5, the removable and washable Silverplus liner is anti-bacterial treated for excellent moisture-wicking and removable cheek pads with 3D contoured foam and a soft textile chin strap broader than certification requirements for optimal safety and rider comfort. In addition, hydration tube channels integrated into the helmet's cheek pads give convenience and performance. The closure system is double D rings.