AWE AWESprint In Mould Adult E-Bike/Bike Road Racing Helmet Black/Neon Medium 55-58cm features an amazing 21 air vents for maximum cooling (including 4 rear). Its in-mould construction fuses the polycarbonate outer shell with the helmets absorbing EPS foam inner core, giving you an exceptionally lightweight and strong helmet. AWE bike/E-bike helmets have fully adjustable unisize headlock systems and multi adjusting buckles for maximum ergonomic comfort, quick attachment and releasing.