The Finer Details The more supportive the shoe, the more stability it can give to your natural stride. A combination of tuned support and intentionally placed cushioning helps you feel secure with every step. The Structure 25 is the most stable shoe in Nike Running. Updated foam midsole works with wider midfoot support and an increased rocker to give you a more stable platform underfoot and smoother transitions from heel to toe. The more cushioning that you have underfoot, the softer and more comfortable your running experience can be. Cushioning helps soften impact as your feet hit the ground. New and improved foam on the midsole provides a soft and comfortable feel as you log your miles. High foam stacks help keep you comfortable. Shaped like a rocker, the foam provides support for the 3 phases of a runner's stride. It offers flexibility when your foot rises off the ground, a smooth ride when your foot is moving forward and cushioning at ground contact. The more responsive the shoe, the more energy return you can get back with each step. Whether you want to run a little bit faster or with a little less effort, responsive shoes help give you slightly more spring in your step to get more out of your run. A Zoom Air unit in the forefoot offers responsive cushioning. Every step helps create energy return to help drive you forward with a springy, responsive sensation. Nike Womens Air Zoom Structure 25