The Brooks Z2 keeps distance runners on track. It's an advanced spike engineered to give better traction for the long haul. Ventilated for quick drying and maximum breathability, it's ideal for negotiating the barricade hurdles of the 3000 meter steeplechase and lapping the field in the 10,000 meters. Microfiber and air mesh upper. CMEVA midsole, TPU strike pod. Pebax® distance plate with five-spike configuration. Includes 6mm spikes and wrench. Wt. 5.4 oz.