The BELLUS is the first model to adapt HJC's SLID technology, which minimizes the rotating impact on the brain in the event of a collision. Thanks to the integration between design and cutting-edge technology, the BELLUS will appeal to a wider range of satisfied customers.HJC bicycle helmets are designed and manufactured to be as light as possible. Density, placement, shapes and materials all play a part in optimizing weight. HJC helmets are tested in the laboratory and in the real world to meet the highest quality standards. HJC is one of the few helmet manufacturers to have its own state-of-the-art wind tunnel laboratory for testing aerodynamics, ventilation, noise and other parameters. HJC's wind tunnel test lab measures air forces under various riding conditions to improve helmet performance. HELMET FEATURES:SELFIT - an automatic self-adjustment system that represents a revolutionary technology in cycling helmet fitting. Once the helmet is adjusted to your head, it no longer needs to be adjusted, even if your head moves while riding. The SELFIT system automatically adjusts the space and ensures a constant fit and comfort for your head. The five press-fit positions ensure a constant fit and comfort for all types of head shapes and sizes. The rider can fine-tune the fit, resulting in a perfectly fitting helmet for a perfect ride every time.COOLPATH - A new technology replacing internal padding that allows fresh air to circulate around the head and increase comfort while riding. The fresh air flow and light weight of the helmet improve fit and provide an excellent riding experience. A certain amount of air passes through the front air intake, circulates inside the helmet and finally exits through the exhaust port. This increases internal airflow to cool the head and dissipate heat.SLID - HJC has developed this safety feature by adding a special GEL material. SLID is placed inside the helmet to reduce the amount of energy delivered to the brain by providing a rotational function. The advanced GEL material inside the SLID liner has fluidity properties. This helps minimize the forces and energy impacting the brain by dissipating the impact.