The C91 helmet will offer riders some of the best features on the market at a budget friendly price. Starting with the Advance Polycarbonate Composite Shell. It provides a lightweight helmet with a superior fit and comfort using advanced CAD technology. The chin bar operates with an easy to use single lever and is user friendly with gloves. It also includes an internal sun shield with a manual mechanism that moves forward and back with ease. The large top vent allows airflow ventilation throughout the deep EPS channels of the helmet keeping you cool on rides. The SuperCool top liner and cheek pad interior gives additional cooling features with its moisture-wicking fabric. The C91 is also Smart HJC ready to accept the 10B or 20B Bluetooth systems (*sold separately). SMART HJC SMART HJC 20B and 10B Bluetooth communication system co-developed with SENA tailored specially for HJC helmets. SMART HJC can be installed on HJC s various models and due to the compact size and aerodynamic design of the Bluetooth unit