NIKE Men's Zoom HJ III - Field Event Spikes 317645 104 fabric-and-synthetic Synthetic and mesh upper provides support without the added weight. Full-length Phylon midsole. Sculpted midsole arch with carbon fiber shank for support. Tapered midsole PU puts the foot in proper position at take off. Eleven, lightweight, aluminum receptacles molded in a rigid full-length plate. Full-length rubber wrap for traction on the apron.