The Kask Zenith X2 Hi-Viz Arborist Helmet features a lightweight Hi-Viz external shell with exponentially better performance, and an internal shell designed with a low-density inner core optimized for protection from top impacts. It is non-vented, and provides protection against side, front, and rear impacts. The adaptive fit system features a size adjustment system that integrates a new, double diameter dial for easier size adjustments, ergonomic side wings to ensure a fast and secure fit against the back of the head, and the latest Self Adaptive Live Hinge self-adjusting fit technology that moves as the wearer moves. This helmet meets Class E (Electrical) protection standards, and features color-coded fasteners on the chinstrap to indicate that the helmet meets EN 12942 standards.