6D Helmets Alterra Helmet Segment Slate Blue - M/LSets a new standard for full face enduro helmets, combining a lightweight design, effective ventilation, and all day comfort without compromise. Featuring Omni Directional Suspension (ODS) for advanced impact protection, an in molded carbon fiber chin bar, and optimized airflow, it delivers full coverage without the bulk Certified for e bike and downhill riding Meets or exceeds CPSC, EN1078, AU NZS 2063, 8776 E Bike standards, as well as ASTM F1952