Arai Vector-2 Full Face Motorcycle Riding Race Helmet- ID Arai's multi-density EPS liner is like no other, comprised of up to 5 different densities in some models which is molded into a single piece New ACF-2 front intake vent has an oversized intake opening for better airflow, and a sliding-door mechanism to more completely close it Brow Vent Faceshield Ventilation System provides cooling air in upper face area without holes in critical forehead area of the shell or in the impact-absorbing liner material Extreme peripheral view - same wider field of side to side visibility as the top-of-the-line Corsair V racing helmet (an additional 5mm on each side when compared to to previous Vector model) Intermediate Oval - This shape is designed for the rider whose head has a front-to-back dimension that is longer than the side-to-side dimension. This is a neutral head-shape design which tends to fit most riders well.