Track shoes/Spikes Nike Ja Fly 4 - Top4Running.com。Leave the competition behind in Nike\'s elite-level sprint spike, the Ja Fly 4. Built to be incredibly lightweight and aggressive, this spike will elevate performance on race day. Speaking of lightweight, the Ja Fly 4 is approximately 9% lighter than the Ja Fly 3, making it the lightest Nike sprint spike to date. The Ja Fly 4 is equipped with a newly engineered woven upper that provides a secure lockdown, while the notched racing laces are featherweight and give just enough stretch to keep them secure on those fast turns around the track. Overall, the Nike Ja Fly 4 is the perfect option for elite-level athletes who specialize in sprint distance events. 100% Brand New Without Original Box (Replacement Box will be Provided)