MIPS® Brain Protection System reduces rotational forces caused by angled impacts to the head AS/NZS263 certified Designed for ultimate integration with Smith performance eyewear for maximum comfort, venting and storage convenience AirEvac ventilation system integrates with Smith eyewear for fog-free lenses VaporFit dial adjustment system offers 270-degree fit adjustment with the turn of a dial 21 fixed vents for consistent airflow Performance comfort lining Lightweight, low-bulk single layer webbing Weight (Size M, MIPS®): 11 oz / 300 g