Fox Metah Flow Helmet 2018Fox is no stranger to designing no holds barred helmets for riders who catch their fun fix from the trail, and the Metah is no exception. Through Fox's new Varizorb lining material the Metah combines multiple densities of cone-shaped EPS foam in tactically designed layers for maximum variable impact absorption and protection. Ten strategically placed intake vents keep air flowing efficiently throughout and reduce weight, while the sealed liner wicks away uncomfortable moisture. Making it easy to dial in the perfect fit is the new single hand dial actuated retention system and the fixed anchor strap system.FeaturesFirst Fox All Mountain helmet with lower coverage on back of head for added protection10 Big Bore vents provide improved airflow and reduced weightFox Varizorb multi-density impact reduction system provides superior protectionFixed anchor Y-Strap system offers simple on and off and improved fitPremium liner with sealed edges for increased comfort and moisture managementSingle hand dial actuated retention system provides easy adjustmentWeight: 405gSizingHow to Measure:With a cloth measuring tape, find your heads circumference just above the ears.Helmet SizeExtra Small/SmallMedium/LargeLarge/Extra LargeHead Circumference21.5"-21.75"21.8"-23.25"23.25"-23.75"