Bell Star Pro Race Helmet with Tinted Eye Shield 2016 Fusion In-Mold Polycarbonate Shell is the result of an in-molding process which bonds the helmet's Microshell to its EPS foam layer for a sturdier, more solid helmet Progressive Layering uses a EPS foam liner that's constructed in 2 layered parts, each using different material densities, to help manage the energy of impacts Active Aero Slider vent lets the rider regulate airflow, temperature and aero efficiency on-the-fly with a simple button seamlessly integrated into the top of the helmet 15 channeled vents bring cool air in through the front, allowing it to pass over your head and then flushes warm air out of the rear ports -- so YOU stay cool and your HEAD stays cool