With the Bullet 2. 0 Helmet from Lazer, lack of ventilation is never an expense you'll have to make in your quest for aerodynamics. Featuring a narrow shape and a closed shell on demand, it's fast on the flats and in the sprints, and with a quick adjustment to the Airslide system on the front, you'll have ample ventilation on hot days and on the climbs. Internal ventilation channels work to keep your head cool and comfortable while Lazer's Venturi Cap technology accelerates the airflow through the helmet.When it's time to dial in your BOAs for the sprint, a simple slide of the Airslide system shuts the vents leaving you with a fully closed cap, for optimized aerodynamics. The Bullet 2. 0 helmet is compatible with Lazer's magnetic lens, providing increased aerodynamic performance and protection with a comfortable panoramic lens and nothing touching your face. Reflective decals and a rear LED light increase your visibility at night while its compatibility with its LifeBEAM technology, measuring heart rate, and an Inclination Sensor to monitor your head position on the bike make this one smart helmet.