Award-winner and trail crusher, the Superior has long been a fan-favorite. Altra built on the success of it's previous versions by adding even more reinforcements in the upper. Altra also included its new 4-Point GaiterTrap to keep more debris, dirt and sand out as you shred the trail. The DuraTread outsole is both nimble and tough so you can run over gnarly terrain with confidence and finesse. Ideal for trail running, ultrarunning, trail racing and fast packing.