: Even in aero mode, internal channels and a rear "Venturi cap" accelerate airflow through the helmet to keep your head cool.
: The shell is compatible with Lazer's LifeBEAM heart rate monitor and an inclination sensor that alerts you if your head position is no longer aerodynamic. Considerations buy lazer bullet helmet
: This unique sliding vent on the front allows you to manually switch between a fully closed aerodynamic shell for sprints and an open configuration for ventilation during climbs. : Even in aero mode, internal channels and
Lazer Bullet 2.0 Helmet - Cycling News | Bike Reviews - Road.cc : Even in aero mode