Terrafly - Premium outsole, designed to be extremely durable, for road or trail running. * EVA injected midsole - Cushions your foot when running on the toughest of terrains. * Endurance Rubber Compound - This has been formulated for an optimal balance on wear and mixed terrain grip. * The 2 Arrow Shoc-ZoneTM offers scintillating performance as a race day shoe for club runners, whilst also providing sufficient under foot protection for the elite to use regularly. * Based on the shape of the foot, this is Inov-8"s most natural fit. More room in the toe box allows the toes to spread.