Mesh upper with rubber sole.Lace-up front.Waffle mesh tongue with logo patch detail.Your foot sits on top of full-length ZoomX foam.Air Zoom unit offers our optimal level of springiness underfoot, unlocking a level of speed and responsiveness that'll put pep in your miles.ReactX foam, 13% more responsive than previous React technology, sits at the bottom of the ZoomX foam and Air Zoom cushioning.Low-cut padded collar