HJC H-Sonic Helmet the HJC H-Sonic Helmet has been created for road riders who want performance and comfort and a focus on achieving the very best protection alongside a superior degree of ventilation. Using their extensive experience in creating helmets for two-wheeled motorsports, HJC has created the H-Sonic Helmet with the same attention to detail and a focus on blending both safety and warm-weather performance.In the event of a crash, rider safety is taken care of via the in-mould technology. This sees a tough polycarbonate shell directly moulded to an EPS foam liner, complete with an internal reinforcing structure. This provides structural strength, improves durability and provides reliable shock-absorption in the event of head impact. But safety isn't the only area where the H-Sonic excels. The HJC engineers have also paid close attention to both internal airflow and vent placements. Using wind-tunnel testing and computer modelling, the Advanced Air Channel System has been created. With a total of 24 intake and exhaust vents and inner channels, it provides a cool rush of air across the scalp. At the same time, the exterior offers smooth aerodynamics for high-speed performance. Achieving a secure and comfortable fit is made easy with HJC's 3D fit System. This cradle system features a twist dial to the back, allowing you to get a precise fit, every time you put it on. Features:In-Mould Technolgy - EPS liner with Polycarbonate shellReinforced StructureAdvanced Air Channel System with 24 ventsEasy-adjust 3D fit SystemWeight: 210gEN 1078 CertifiedSizes: XS/S 54-56 cm, M/L 57-59 cm, XL/XXL 60-63 cmBuy HJC Helmets from Chain Reaction Cycles, the World's Largest Online Bike Store.