The Zone 5 Air Line Bluetooth helmet is designed for total user comfort and protection. It has a shell made of thermoplastic ABS and a double-density EPS lining that can also be removed for cleaning. On the front and top, it has a total of 4 vents that, along with the 2 rear vents, provide adequate ventilation at all times. The helmet has a buckle for a more secure fit. It also comes with 4 side holes to improve hearing on the road.Referencia: HC1128BTH