Nike Men's Alphafly 4 "Proto"

The record-breaking racer is back and badder than ever. Nike updated the Air Zoom unit for the first time in the Alphafly's history, making it softer and quieter. It doesn't stop there—advancements to ZoomX foam deliver more bounce with less weight opening up marathon potential for every runner. An evolved Air Zoom unit delivers a softer feel underfoot and more energy return than the previous model—all while keeping quiet. An advanced ZoomX foam delivers a lighter and bouncier ride than the Alphafly 3 and offers smooth, stable transitions. A wide carbon fiber Flyplate unlocks a propulsive sensation while maintaining the stability runners need to go the distance. Atomknit upper is lighter than the Alphafly 3 and designed for more breathability and containment than ever before. Added cushioning in the curved forefoot Zoned midfoot cables Low collar