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