Bell Full-Air MIPS Helmet Pedal up. Send it down. The Bell Full-Air MIPS is built for riders who are their own shuttle - a true full-face helmet that breathes and feels like a half-shell. ASTM F1952-15 downhill certified, it delivers the protection you need on the descent without punishing you on the climb. An open, ventilated design keeps airflow moving, a modular cheek pad system lets you dial in coverage or airflow to taste, and a Fidlock(R) magnetic buckle makes chin strap operation effortless. A breakaway under-visor camera mount is ready for POV footage, and Advanced Mips(R) Evolve keeps rotational forces in check. This is what it looks like when a full-face actually wants to go uphill. Features Advanced Mips(R) Evolve System integrates the slip plane directly into the retention system to help reduce rotational forces in certain impacts, while keeping the helmet lightweight and well-ventilated ASTM F1952-15 downhill certified legit full-face protection without the weight and heat of a traditional DH lid Fusion In-Mold Polycarbonate shell with Dual Density EPS for a lightweight, structurally sound construction Modular cheek pad system remove sections for maximum airflow on climbs, add them back for extra security on the descent2-position Flying Bridge Visor with eyewear and goggle storage compatibility Breakaway under-visor action camera/light mount for capturing POV runs without zip ties or additional hardware Fidlock(R) magnetic buckle for quick, effortless one-handed chin strap closure Removable temple pads for additional airflow customization Sweat Guide(TM) channels moisture away from the face during hard efforts Removable, washable antimicrobial liner for easy cleaning and long-term freshness E-Bike certified (NTA 8776)SPECIFICATIONSShell Construction Fusion In-Mold Polycarbonate MIPSAdvanced Mips(R) Evolve System Helmet Style Full-Face Safety Certifications US CPSC, CE EN 1078-2012, AS/NZ 2063, ASTM F1952-15 Downhill, ASTM F2032-15 BMX, NTA 8776 (E-Bike)Intended Use Enduro, Downhill, Trail Sizing Size Small Medium Large XLHead Circumference (in)20. 125 - 21. 5"21. 625 - 22. 375"22. 375 - 23. 5"23. 5 - 24. 625"Head Circumference (cm)51 - 55cm55 - 57cm57 - 60cm60 - 63cm | Bell | Full-Air Mips Helmet Men's | Size Medium In White