Design & Technology: Cycling helmet designed to look great and fit smoothly Zonal Koroyd(R) coverage offers lightweight and energy-absorbing impact protection MIPS(R) Brain Protection System reduces rotational forces caused by angled impacts to the head for added protection Adjustable dial fit system offers a more customizable fit AirEvac(TM) ventilation system integrates with Smith(R) eyewear for fog-free vision 21 fixed vents provide consistent airflow Performance comfort lining Lightweight, low-bulk single layer webbing Two-position adjustable visor Designed for ultimate integration with Smith performance eyewear for optimal comfort, venting, and storage convenience Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older