A full commitment to speed and efficiency means never having to compromise thes the idea behind the bell star pro helmet a game changing aero road helmet that gives riders the power to optimize performance on the fly in ever changing race situations switch from full ventilation on climbs to wind slicing aerodynamics in the sprints and flats with its groudbreaking active aero technology which can be engaged with the simple slide of a button the star pro is engineered to be super fast and s