Employs abrasion-resistant water barriers in high-wear zones prone to trail damage, best ultra running trail shoes.

Feel the speed with the Superior 6. Designed for dynamic trail running, this shoe boasts a MaxTrac outsole and multi-directional lug pattern for superior traction on any terrain. The updated StoneGuard is lighter and more efficient, providing essential protection without weighing you down. With its innovative "burrito" style wrap-around tongue, enjoy a secure fit for swift trail adventures. Lace up and unleash your speed with the Superior 6.

MIDSOLE

• Altra Quanticmidsole balances cushioning and responsiveness while remaining lightweight.
• Inner Flexflex grooves system provides additional flexibility and cuts weight for increased performance.
• Natural Ride System (NRS)design includes a more natural, foot-shaped last, zero millimeter heel to toe drop, and metatarsal-specific shapes in the outsole to assist in proper foot mechanics and allow for more natural foot movement.
• Natural Foot Designfollows the natural shape of the foot for ultimate comfort.

OUTSOLE

• Trail Claw outsoledesign uses a sticky rubber multi-directional pattern, combined with updated lugs under the forefoot and claws under the toes to provide improved grip and stability on trails.
• FootPod outsoledesign follows the natural construction of the human foot for maximum flexibility and a responsive ride.
• MaxTrac Outsoleuses anatomically-shaped sticky rubber that prioritizes grip and durability on uneven terrain.

UPPER

• Vamp Meshis updated for breathability while offering protection from rogue debris
• Gaiter Trapis a velcro strap that secures trail running gaiters to the shoe, preventing debris from building up beneath the shoe (sold separately).
• Ripstop Quarter Paneloffer additional protection to the upper while being lightweight
• Standard Footshapeis Altra's most common footshape that sits right in the middle of the Original and Slim fit options. This fit will be slightly slimmer than the Original roomier fit.

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Consistent waterproof performance requires no reactivation treatments between trail sessions, best trail running shoe brands 2025.