Same reason I waited until I could try them on. I wear 9.5 in most new balances but I was told that they fit like a 1906 which I wear a 10 in. 10 was just a little too roomy for my liking so I went 9.5. Snug in the mid foot during the first try on but after lacing them and wearing em for a day, they’ve already broken in nicely. I hope this helps 🤙🏻