Since 1971, HJC has specialized in manufacturing motorcycle helmets exclusively. The combination of this extensive specialized manufacturing experience, innovative ideas, and reasonable pricing resulted in HJC's success in worldwide markets. It is HJC's continual goal to provide high quality, comfortable, and reasonably priced helmets to motorcyclists around the world. Advanced Polycarbonate Composite Shell. ACS Advanced Channeling Ventilation System. Pinlock®-Ready HJ-34 Visor. Aerodynamic Uses the Pinlock®-Ready HJ-34 Shield as a replacement or upgrade. Pinlock® inserts are sold separately.