Nike ZoomX Dragonfly Bowerman Track Club Track & Field Distance Spikes MADE TO FLY. Light, breathable, and bouncy—these are the ingredients for taking down your personal record. The Nike ZoomX Dragonfly delivers the speed you need to stand out from the pack in races from 1,500 to 10,000 meters. Details throughout celebrate the Bowerman Track Club and the athletes it has inspired. Remember the Club The Bowerman Track Club has been giving runners of all skills and distances the tools to reach their personal goals. Colors and graphics throughout help celebrate the club and the athletes who have given their all for the run. Efficient Energy Return Nike ZoomX foam uses cutting-edge engineering to turn the impact of your step into energy for your next stride. It's lighter, softer and more responsive than other foam. Race Ready Lightweight mesh provides breathability and support made to go the distance. Ridged Design The forefoot plate with spikes was created using data from hundreds of runners. It helps ensure a smooth transition from toe-off to heel strike. More Details Detachable stainless steel spikes World Athletics approved Weight: 4.4oz (Men's size 8/Women's size 10) Sizes shown for Unisex shoes are in Men's US, Women's equivalent are 1.5 larger e.g Men's US 8 equals Women's US 9.5.