Giro's Sapphire helmet is lightweight, comfortable, and aesthetically pleasing. an internal Roll Cage reinforcement and its In-mold construction provide peace of mind. 19 massive Wind Tunnel vents channel air around your head for superb ventilation. And, the sculpted fit and Roc Loc 5 retention system will have you wondering if the Sapphire was custom-made for your head. In fact, the ventilation, light weight and superb fit are so impressive, you might wonder if you're wearing a helmet at all.