Women's Nike Air Zoom Structure 20 Running Shoe RUN WITH FULL FORCE. The legacy lives on with Women's Nike Air Zoom Structure 20 Running Shoe. It has been updated with a Dynamic Support midsole to smooth the transition from heel strike through toe-off. The Flymesh constructed upper and midfoot system provide zoned support and total lockdown. Dynamic Fit technology locks the foot down. Flymesh construction provides targeted ventilation and support. Dynamic Support midsole smoothes out the transition. Flywire cables integrate with the top 2 eyestays to enhance support. Honeycomb outsole pattern is durable and provides great multi-surface traction.