Design: Single-layer mesh upper provides breathability and durability Wider forefoot and base allows you plenty of space and a smooth ride Added structure and containment around the heel provides a more supportive fit Grooves in the forefoot to create flexibility, and vertical grooves down the side help create stability Molded heel securely hugs your foot Laces cinch down for a secure feel In-Shoe Comfort: Softened materials on the inside of the heel, collar, and the tongue feel smooth and comfortable Zoom Air unit in the forefoot offers responsive cushioning and energy return Features more foam than previous Structures with better support and comfort Shaped like a rocker, the foam provides support for the 3 phases of a runner's stride Durability & Traction: Durable rubber outsole is built for mileage