A plush, light, and soft midsole combines with an intensely grippy Vibram(R) outsole for a shoe that's designed to go the distance. All terrain. All day. Design: Breathable engineered mesh upper helps keep feet cool and comfortable on long trail runs and hikes Original FootShape(TM) fit features Altra's roomiest toe box with extra room through the midfoot for natural movement Zero-drop platform promotes a more natural stride across varied terrain In-Shoe Comfort: Updated Altra EGO(TM) MAX midsole foam is 15% lighter and 10% softer than the previous version for long-lasting comfort High-cushion design with a 33mm stack height helps reduce impact during long training days and ultra trail races Plusher tongue and integrated comfort collar enhance all-day comfort and support Durability & Traction: Vibram(R) Megagrip outsole with TractionLug(TM) delivers adaptive traction, stability, and confident grip on wet or dry terrain Molded TPU overlays help improve protection and durability for rugged trail adventures Additional Details: Best for trail running, all-day trail running, and hiking Neutral support design balances comfort and performance on the trail Weight: 11.45 oz / 325g