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 Box Lid is Missing