The CS-MX II is a competitively priced off-road helmet for riders that value quality and safety. This off-road helmet is composed of the Advanced Polycarbonate Composite Shell to provide a lightweight helmet, with superior fit and comfort using advanced CAD technology. A large eye port provides maximum visibility and superior goggle fit. The "ACS" Advanced Channeling Ventilation system allows full front to back airflow to flush heat and humidity up and out.Advanced Polycarbonate Composite Shell: Lightweight, superior fit and comfort using advanced CAD technology."ACS" Advanced Channeling