Crafted with insights from none other than Cristiano Ronaldo and built specifically for the emphasis his off-pitch training places on “explosive, quick lateral cutting movements and hours of footwork,” the Train Ultrafast Flyknit echoes what Ronaldo loves about the Mercurial Superfly and couples a dynamic fit upper of brand new chainlink Flyknit with a responsive propulsion plate under the foot. The result is a hybrid that’s one part football boot, one part Free Trainer 5.0.