The Nike Zoom Mawler track spike is made for 100-400 meter sprint events. Synthetic one-piece outer shell provides an aerodynamic fit on the track. Innersleeve construction cradles the foot for a snug, secure fit. Thin, compression-molded Phylon™ midsole keeps the shoe light and low to the ground while offering impact protection. Full-length Pebax® plate with a carbon fiber insert gives lightweight, supportive snap off the track. Seven permanent 7mm Christmas tree spikes. Wt. 8.6 oz.