Nike air zoom structure 20 run shoesthe legacy lives on with these nike air zoom structure 20 run shoes they have been updated with a dynamic support midsole to smooth the transition from heel strike through toe off the flymesh constructed upper and midfoot system provides zoned support and total lockdown featuresmaterial polyester text synthetic plasticdynamic fit technology locks the foot downflymesh construction provides targeted ventilation and supportdynamic support midsole smoothes out