It's an issue wrote:
You are confusing something worn an entire race with something changed during a race. Rupp, Kipchoge, and Lilesa did not switch shoes during the race.
Actually I was responding to Rojos comment about fairness and some runners not knowing whether they could or could not do something..... Too many people complaining about what is and is not fair. It is perfectly within the rules and fair to have a better/smarter strategy than someone else. The argument of no one said we could do that just doesn't hold any water.