Get ready to hit the road in the responsive cushioning and secure fit of the Nike Air Zoom Structure 24. Those insights also created an airy upper with breathability right where you need it. Cushioned Responsiveness A Zoom Air unit in the forefoot offers responsive cushioning. Every step helps create energy return to help drive you forwards. It's combined with a foam midsole for a firm, yet smooth and stable feeling as your foot hits the ground. Backed By Data Data from hundreds of runners helped inform the crash pad placement at the heel. It helps provide extra cushioning for heel-to-toe transitions, supporting runners that tend to overpronate. That info was also used to put cooling exactly where you need it on the upper. Flexible and Tough The durable rubber sole is built for mileage. Grooves in the forefoot to create flexibility and vertical grooves down the side help create stability.