The Altra Women's Olympus 4 Shoe is a trail running shoe designed for all-terrain Performance and long-distance comfort. With max cushioning and an aggressive Vibram MegaGrip Outsole, these puppies Are like off-road tires for rugged trails. The lightweight mesh Upper keeps your feet nice and cool, the FootShape toe-box gives your toes plenty of room to splay out, and the GaiterTras keep your gaiters in place and keep dirt, rocks, and Snow from sneaking in. Features of the Altra Women's Olympus 4 Shoe Sticky VibramA(R) Megagrip(TM) Outsole that excels in both wet and dry conditions Premium tongue for tailored lock-in feel Engineered mesh Upper for increased breathability and durability Stack height of 33mm