It’s a poorly guarded secret that professional runners routinely compete in prototype racers.
Lesser known: you can actually buy them. At least in theory.
“Shoes must be available for purchase by any Athletes participating in World Rankings Competitions,” according to World Athletics regulations.
Usually that means a handful of examples set aside for expos and college campuses.
But Faith Kipyegon’s one-off middle-distance spike, used during her Breaking4 attempt last year, looks to be getting a wider rollout than the rest.









