The Bullet 2.0 helmet provides an answer to the age-old dilemma of ventilation versus aerodynamics. With its narrow shape and closed shell it is a seriously aerodynamic helmet but a quick adjustment to the Airslide system turns it into a helmet with sufficient ventilation to tackle climbs on hot days. With its adjustability, the Bullet 2.0 is a road racing helmet for every day, but one that packs serious aerodynamic performance. When ventilation is required, the Airslide system can be utilized to open up the front of the helmet and create an airflow throughout with exhaust vents at the rear. When ventilation is of lesser importance, the entire Airslide system can be exchanged for a fully closed cap, creating an even more aerodynamic version of the helmet. but whatever configuration you use the side, rear and top Venturi cap combined with internal airflow channels make sure there is always airflow inside the helmet, even when going full gas in aero mode. On top of this the Bullet 2.0 helmet also allows a quick and easy installation of the LifeBEAM technology to measure your heart rate, or the Inclination Sensor to monitor your head position on the bike. FASTER!