Inov-8 Men's Road-X Extreme 208-M 100% Synthetic/Thermoplastic Polyurethane/Mesh Imported Rubber sole Meta-Flex - Forefoot flex grooves give the forefoot greater freedom of movement and allow you to be more reflexive. Fusion Sole - Blended synthetic Lite Rubber and EVA foam, injection moulded to provide a midsole that is lightweight but protective. 2 Arrow Shoc-Zone - Offers scintillating performance as a race day shoe for club runners whilst also providing sufficient under foot protection for the elite athlete. Natural Fit - 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 move around more freely. Low Profile Design - 6mm heel to toe drop encourages a lower feel and sleeker look.