Olympics 2016: Nike unveils new track spikes for Rio - Sports Illustrated
Nike on Twitter: "This summer, it's personal. The Nike Zoom Superfly Flyknit designed for Allyson Felix: https://t.co/zDhFLvTtdJ https://t.co/Wm4pNHGzs8" / Twitter
The Nike Zoom Superfly Flyknit Is Specifically Optimized for Sprinter Allyson Felix - Freshness Mag