6D Helmets Alterra MTB Helmet - Segment - White-Gray

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.