Features: Designed with a combination of sleek looks, all-day comfort, optimal performance, and features to help protect in the event of an impact ARS Fit System provides progressive fit adjustment via an easy-to-use thumbwheel Fit system distributes pressure evenly around the head to eliminate hot spots and pressure points Multi-Directional Impact Protection System (MIPS) Spherical Technology reduces rotational forces from certain impacts and eliminates the plastic slip plane design Sphere MIPS has been awarded the Virginia Tech 5-Star "Best Available" protection rating Eighteen vents orientated at a 15deg angle assures maximum airflow when the helmet is in the riding position Designated eyewear docking slots keep your glasses securely tucked away when not in use Adjustable head basket is ponytail friendly Optional Aeroshell accessory protects against harsh elements CPSC 1203 COMPLIES WITH U.S. CPSC SAFETY STANDARD FOR BICYCLE HELMETS FOR PERSONS AGE 5 AND OLDER