The Finer Details A combination of tuned support and intentionally placed cushioning helps you feel secure with every step. 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. 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. Durable rubber sole has grooves in the forefoot to create flexibility, and vertical grooves down the side help create stability. Single-layer mesh provides breathability and durability. Nike Mens Air Zoom Structure 25