UNRIVALED COMFORT : Built on the F5 chassis and adding to its engineered capability to provide all-day comfort, the F5 Koroyd adds safety and ventilation technologies to provide protection, reduced weight and enhanced ventilation and carries the DOT certification for on-road use. Challenging long-held industry methods, the F5 is leading the way in head protection technology and providing the best possible riding experience. Koroyd® is a next generation energy absorbing technology, engineered with a unique structure and innovative energy management properties. When impacted the Koroyd cores crush homogeneously, decelerating the energy from the impact. MIPS® brain protection system is a low-friction layer designed to reduce rotational motion from angled impacts the head.