Kask vertigo road helmetvertigo helmet has been designed and developed for a professional use it is safe ventilated and aerodynamic this helmet offers unsurpassed comfort and fit features expanded polystyrene shell that optimizes crash impacts 100 made in italy unique hinged adjustment system that allows for both size and updown adjustment which together comfortably cradle the nape of the neck the helmet size can also be adjusted by using either the dial or finger push system ventilation