HJC C10 - Motorcycle Full-Face Integral Helmet with Advanced Polycarbonate Shel The C10 is an all-new competitively priced full-face helmet for riders of all ages that value quality and safety, offering a lightweight superior fit thanks in part to its Advanced Polycarbonate Composite shell that was designed using advanced CAD technology. Combined with a wide-view optically-superior face shield and its improved “ACS” Advanced Channeling Ventilation system that allows full front-to-back airflow to flush heat and humidity up and out, the C10 provides a safe and comfortable ride no matter the conditions. With sizes ranging from 3XS to 2XL, the C10 delivers the same great protection for both youth and adult riders alike.