Mens Alphafly 4 Proto

Nike's legendary marathon racer is back and lighter than ever. The Alphafly 4 gets the first update to its Air Zoom units in the shoe's history, making them softer and quieter, while advances to ZoomX foam deliver more bounce with less weight. Updated forefoot Air Zoom units deliver a softer, quieter feel with more energy return Dual ZoomX cushioning: ZoomX foam paired with ZoomX LT, the lightest version of Nike's most responsive foam Wide carbon-fiber Flyplate for propulsion with stability over 26.2 miles Atomknit upper with open-hole mesh zones for breathability and midfoot cables for containment Approx. 188 g / 6.6 oz (Men's US 8.5); 8 mm heel-to-toe drop Colorway: Sea Glass/Laser Crimson/Phantom/Burgundy Ash (IU4686-002)