Design:A supportive piece under the arch adds stabilityIn-Shoe Comfort:Springy foam helps you stay fresh until the final buzzerA big forefoot Air Zoom unit offers a different level of velocity, either on the run or out of a standstill position The bottom layer of the upper has Nike Air cushioning at the heel to add a pop in your step Durability & Traction:The outsole pattern looks like a topographical map, with an array of contoured ridges that bend and deflect in multiple directions to provide traction for every move