When developing the Ultraventure, Topo was inspired by feedback from their trail and ultrarunners. These runners are running tons of miles, so designers started with a healthy portion of foam. Then they designed it to offer a little guidance which helps keep you on track when your body starts to break down. Also, the roomy toe box is reminiscent of an Altra shoe but 5mm heel-to-toe drop is a little easier on the calves during super long runs. With the addition of an aggressive Vibram outsole with 6mm multidirectional lugs, it's hard not to take this shoe seriously. Finished off with a fully gusseted tongue and an abrasion-resistant mesh upper, the Ultraventure shows the trail running world that Topo is not playing around!