A propulsive speed training partner. Who doesn’t want to go Mach speed? Our thoughts, exactly. A plated daily trainer that brings the heat to speedwork, our Mach X 3 is the perfect addition to your running arsenal. Built for up-tempo... Best For: Everyday Run Specifications: Warp knit upper Dual-density midsole with PEBA top layer Pebax® plate Speed-centric MetaRocker™ Compression molded sticky rubber We’ve added a softer tongue, more breathable upper, and refined the collar.