Demanding terrain doesn't stand a chance against the rugged capabilities of Altra Superior 2.0 running shoes. Trail runners will love the reliable performance of a sticky rubber outsole, quick-drying mesh, and excellent flexibility. FootShape™ technology allows your toes to relax and splay into a natural position for improved comfort and stability during uphill climbs and downhill descents. Altra Superior 2.0s are the selection for the Editor's Choice award from Runner's World magazine.Upper: Padded tongue and heel collar enhance comfort. Flat laces reduce irritation. Quick-Dry Trail Mesh offers breathable flexibility. Minimal Seams provides enhanced comfort. Gaiter Trap located on the heel.Midsole: Zero Drop™ Platform places your heel and forefoot the same distance from the ground to encourage proper low-impact form. A-Bound™ recycled energy-return compound sits directly under the foot to reduce the impact of hard surfaces and add a spring to each step. InnerFlex™ grid-like flex grooves in the midsole allow the foot to flex where it needs for more speed and better performance.Outsole: StoneGuard™ offers flexible protection from the rugged terrain by deflecting rocks into the midsole for a smooth, stable ride. Trail Claw™ positions canted lugs directly below the foot metatarsals and “claws” near the front of the shoe for incredible traction in any trail condition.