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6D Alterra MTB Helmet Advanced Protection Meets All-Day Comfort The 6D Alterra redefines what a full-face enduro helmet can be—delivering industry-leading impact protection, a featherlight design, and premium ventilation without sacrificing coverage. Engineered with 6D's exclusive Omni-Directional Suspension™ (ODS) technology, the Alterra is built to keep you safe whether you're charging steep descents, tackling technical terrain, or spinning out long e-bike miles. At just 710 grams (M/L), it's one of the lightest full-face MTB helmets certified for DH, BMX, and e-bike standards, offering elite-level safety with day-long comfort. With goggle and glasses compatibility, intuitive airflow design, and a secure Fidlock closure, the Alterra is everything aggressive enduro riders have been waiting for. Key Features Omni-Directional Suspension™ (ODS) Patented 6D technology minimizes angular and linear impact forces with a unique dual-liner suspension system. Dual-Liner Construction Multi-Impact EPP inner liner + EPS outer liner for layered energy absorption across a broad range of crash intensities. Carbon-Reinforced Shell System In-molded carbon fiber internal roll cage + polycarbonate outer shell = uncompromising strength without added bulk. Carbon Fiber Chinbar Reinforced for increased durability and lightweight protection in high-speed impacts. Ventilation Over-brow intake channels, large rear exhaust ports, and internal sub-channeling keep air flowing efficiently to reduce heat buildup. Premium Fit & Comfort Ionic+™ antibacterial comfort liner Includes multiple pad sets and comfort liners for a customizable fit Fidlock magnetic closure for one-handed operation Trail-Ready Features Goggle-compatible with under-visor storage Glasses-friendly design 3-position adjustable visor with snap-away feature Travel Bag Included Certifications Meets or exceeds the following standards: CPSC EN1078 AU/NZS 2063 8776 E-Bike Standard ASTM F1952 (Downhill) ASTM F2032 (BMX) Weight 710g (Size M/L) The 6D Alterra is more than just a helmet—it's a performance-driven safety system for riders who demand the best. Whether you're racing enduro stages or conquering alpine descents, trust the Alterra to keep your ride dialed and your head protected.