The Topo Pursuit has a Zip Foam midsole with a 28mm stack for a plush and responsive ride. The shoe also has the Vibram Megragip outsole for unmatched traction, while the zero heel-toe drop promotes natural foot position and stride. Look no further for the next trail runner you'll fall in love with. This is a fantastic shoe for the Eastern Sierra trail running when you're looking for a light and fast shoe.