Be the first to the finish line with Brooks Mach 18 Spike. Upper contains 3D Fit Print synthetic overlays to add structure and flexibility. Midsole consists of lightweight EVA to provide cushioning that lasts. Outsole has a Pebax Rnew spike plate and an aggressive contact rubber lug pattern which allows for extra traction. Includes 6mm spikes and wrench. Wt. 4.4 oz.