Lazer Z1 KinetiCore Cycling HelmetOptimized rotational impact protection weighing only 220g in a size M. The Z1 KinetiCore is the one for those looking for a featherweight with best in class ventilation. The One. Z1 KinetiCore has been engineered to be both lightweight and allow excellent ventilation, as well as to provide high levels of safety. Taking the iconic Z1 as a starting point, worn by famous athletes such as Andre Greipel on the Champs Elysees, we kept eveything that it was