Light and flexible is the name of the game here. A lot of mesh for breathability and Charged Cushioning to help protect against impact. Just put them on and run for miles. Lightweight mesh upper delivers complete breathability. Foam padding placed around your ankle collar & under the tongue for an incredibly comfortable fit & feel. Charged Cushioning midsole is firmer in the heel & softer in the forefoot for support & comfort. Tire inspired outsole pattern provides ultimate flex & superior traction.