Heidi Burgett on Twitter: "Nike unveils the Nike Air Zoom Mercurial (w/ Flyprint upper), Nike Air Zoom BB NXT (available July 1), Nike Air Zoom Viperfly, and Nike Air Zoom Alphafly NEXT%.
Nike unveils Alphafly NEXT% and Viperfly, and they are legal - AW
Can Nike's AIR ZOOM VIPERFLY Break Usain Bolt's 100 and 200 Meter World Records? - YouTube