NIKE Zoom JA Fly 2 Running Spikes Lightweight Synthetic Leather upper - provides protection, comfort, and a supportive fit. Mono-Wrap Tongue - the tongue stitched to one side of the upper for an improved fit. Asymmetrical lacing - wraps the foot to the shoe and relieves pressure over the top ridge of the foot Flywire over the midfoot - is made of high tensile strength fibers layered between TPU and foam for a strong, lightwei Phylon Wedge - is a midsole foam piece in the heel for lightweight, resilient cushioning