Crafted with a breathable one-piece knit upper and a perforated toe box, the Cloudswift 4 keeps airflow flowing to help your feet stay cool and comfortable during runs or all-day wear. The dual-density Helion™ superfoam midsole delivers soft, cushioned landings and explosive take-offs, while the integrated Nylon-blend Speedboard® propels you forward with smooth, responsive energy.