Bell Star Pro Helmet w/ Transitions Shield White / Black L Float Fit: Minimalist, lightweight fit system with an easy-to-turn rubber overmolded dial for adjustments. Active Aero: Integrated slider button opens and closes vents, giving rider the ability to regulate airflow and aero efficiency. Overbrow ventiliation: actively ushers cool air over the head and regulates temperature by drawing cool air into the intake ports and circulating it through a matrix of air channels. Progressive layering: the process of engineering a helmet liner with variable EPS foam densities to better manage the transfer of energies after some impacts. Transitions magnetic Zeiss eye shield integrated eyewear for optimal protection and visibility, changes tint with lighting conditions; removes and stores easily on helmet when not in use.