Olympics 2016: Nike unveils new track spikes for Rio - Sports Illustrated
Why super spikes aren't ruining track and field - Canadian Running Magazine
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