Kask Vertigo 2.0 Helmet Expanded polystyrene shell optimizes crash impacts Multi In-Molding Technology ensures better safety and more comprehensive protection with a polycarbonate layer that covers shell on the top, base ring and back of helmet In-molding technology joins EPS Foam core to the outer polycarbonate shell to ensure better shock absorption Up N Down retention system gives the most precise and comfortable fit thanks to its unique double-pivot design that allows the back of the head to be cradled by straps which are then easily tightened to the optimum tension by a central ratchet wheel. Com