Design & Technology: Cycling helmet designed to feel like it's tailor-made for your head MIPS(R) Brain Protection System reduces rotational forces caused by angled impacts to the head for added protection VaporFit(TM) dial adjustment system offers 270deg fit adjustment with the turn of a dial AirEvac(TM) ventilation system integrates with Smith(R) goggles for fog-free lenses 21 fixed vents work with internal air channels to offer consistent airflow for optimal comfort Pass-through channels allow for eyewear to easily be stored on the front of the helmet Designed for total integration with Smith(R) performance eyewear for increased comfort, venting, and convenience Performance comfort lining Lightweight, low-bulk single layer webbing Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older Weight: 11 oz. Style: PERSISTMIPS