In 200- and 400-meter sprints, an athlete’s control through the track’s curve can add or subtract crucial milliseconds — the difference between being crowned champion and taking second place. For gold-medal-winning American sprinter Allyson Felix, commanding this variable is just one of the many challenges integral to repeating her 2012 success. To address the challenge ahead of Rio, Felix entered into an unprecedented collaboration with Nike, comprising design and engineering research, with the aim of creating a new spike built specifically for the races’ requirements.

The Nike Zoom Superfly Flyknit unites extensive scientific analysis from Nike’s Sports Research Lab (NSRL) with computational design by the company’s designers and pixel-level stitch placement by its Flyknit engineers. Combining this data with perception testing by Felix and additional feedback from her coaches, the collective team precisely adapted the spike’s key elements of strength, fit and flex to Felix’s specifications and biomechanics — exemplified by a long, graceful, powerful stride.