Back and better than ever, the Nike Zoom Structure 20 running shoes bring runners fast and light stability for miles and miles. With this version, runners will enjoy smoother transitions from the Dynamic Support midsole. The comfortable and lightweight Flymesh upper continues to help maintain a secure fit. Fresh colors and design liven up these light stability favorites. Upper: Woven Flymesh upper provides ventilation and support where it's needed most. Yarn creates structure without sacrificing breathability. Flat, wide Flywire cables integrate with the laces and wrap the midfoot for enhanced lockdown. Dynamic Fit technology locks the foot down. Midsole: Updated Dynamic Support midsole creates a smoother transition from heel to toe. Zoom Air unit in the forefoot provides responsive, low-profile cushioning. Removable insole. Outsole: Honeycomb outsole provides durability and multi-surface traction.