Lazer Z1 Kineticore Helmet Lightweight, Comfortable, High Performance When you're climbing a steep hill, sprinting as fast as possible, and going for long-distance personal records, you'll want a helmet that is lightweight, breathable, and aerodynamic. The Lazer Z1 Kineticore Helmet has been refined and is ready for the front of the race. It is a lightweight and comfortable high-performance road helmet with 5-Star Protection Technology that reduces the risk of injury from direct or rotational impacts. The premium ventilation provides 3% more cooling and the Comfortable and Secure Fit keeps your helmet tight with a smooth thumb wheel. Features5-Star Protection Technology that reduces the risk of injury from direct or rotational impact Premium ventilation with 3% more cooling compared to wearing no helmet at all Lazer Advanced Roll Sys that is operated by a smooth thumb wheel SPECIFICATIONSCore Material EPSClosure system Advanced Roll Sys Safety Certifications CPSC, EN 1078Intended Use Road, Road Race Weight220g (Size M)Sizing Size Small Medium Large Head Circumference (in)20. 5" - 2221. 5" - 23. 25"22. 75" - 24"Head Circumference (cm)52 - 5655 - 5958 - 61 | Lazer | Z1 Kineticore Helmet Men's | Size Small In White