The midsole of the Alphafly is a super thick slab of ZoomX foam which is the perfect combination of cushion, responsiveness and bounce. The Alphafly also has two forefoot Zoom Air pods for added springiness. Hidden inside the ZoomX midsole is a full-length carbon fibre plate which keeps the shoe stiff and propulsive. The outsole has a thick layer of rubber in the forefoot and two strips of rubber in the rear. The upper of the Alphafly is Nike’s brand new contoured AtomKnit which is breathable, lightweight and doesn’t absorb water.