The perfect entry level trail running shoe returns in a new package from the ground up. The platform gets a total redesign for a fresh ride. Here??s the nitty gritty on the Topo Athletic MT-5 ?C We updated the stack height to 28 x 23 mm for increased cushioning and bumped the drop to 5 mm. We added our ZipFoam? midsole for a soft step in feel with increased response. Our newly refined Vibram? XS Trek EVO outsole provides excellent multi-surface traction and durability, catered specifically to light to moderate trails.