I had to go half a size up (EU size) going from Vapors 9.5 to X/Pros. To me, they fit a little bit tighter than the 9/9.5.
@nike : bring back the 9.5:emoji_pray:
I bought a woman Vapor Pro with the same size I took for a Vapor X And I didn’t notice any difference. I also bought a man Vapor Pro with the same size and it is fine with me. Maybe the shape of the feet will make a difference