A premier downhill MTB helmet from 100% has landed. The Aircraft is precision-engineered with a fiberglass composite shell providing an ultra-lightweight design. Enhance venting channels manage airflow to create one of the most ventilated DH helmets on the market.50% expanded polystyrene/40% composite fiberglass/5% polyurethane/5% polyesterLightweight design featuring a fiberglass composite shellActive Cooling System maximizes airflow more than any other helmet with a staggering 25 ventilation pointsWashable, antibacterial comfort liner, cheek pads and chin strap covers.Emergency release cheek pads for quick, safe removalIntegrated compartment accepts inflatable emergency release systemsCompatible with most popular neck brace systemsSteel D-Ring buckle provides a secure fit while limiting weightAdjustable visor with machined lightweight aluminum screwsAS/NZS 2063:2008, ASTM F2032-15, ASTM F1952-15, CE EN 1078:2012+A1:2012 and CPSC 16 CFR Part 1203.