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. Performance mesh upper for lightweight breathability. Performance mesh upper for lightweight breathability. Deluxe foam sockliner molds to your foot for added underfoot comfort. Charged Cushioning midsole uses compression molded foam for ultimate responsiveness & durability. Durable outsole pattern for flex & traction.