Z1R Dirt Maxx Vortex Helmet The Z1R Dirt Maxx Helmet provides essential off road functionality with an injection molded polycarbonate shell and a dual density EPS liner. It utilizes 13 intake and exhaust ports to maintain steady airflow during your ride. Features: 13 intake / exhaust ports for maximum ventilation Injection molded polycarbonate shell Fully removable polyester moisture wicking liner and cheek pad Dual density EPS liner D ring chin strap retention system DOT approved