17. Flyknit Trainer
Year Introduced: 2012
A sleek racing flat designed for the 2012 Olympics, the Nike Flyknit racer represented an entirely new method of manufacture. By knitting the upper (no, Nike won't hire your grandmother) Nike eliminated both waste and weight, finding a new way to put material only where necessary, and doing away with both stitching and pattern-cutting. The neon green uppers were all over the Olympics, both on tracks and on the medal stands. Next stop, the streets.