SPIKES TO FLY. The Nike ZoomX Dragonfly lets you perform your best on the track.Lightweight, fast design is built for runs over 1,500 to 10,000 meters. Fast, efficient energy return. Nike ZoomX foam is incredibly responsive and lightweight for optimal energy return and impact protection as you run. Lightweight and ready for competition A lightweight mesh upper provides breathability and support. Grooved design The forefoot plate was developed using data from hundreds of runners.It provides a smooth roll from toe to heel.