Here's the thing, I don't know how Adidas established their shoe size. I have previously bought several NEOs that looked exactly the same and were a half size smaller (I had to buy 9 1/2) and they fit true to size. I bought 9 1/2 and should have bought 9s. Still gave 5 stars because it's not the seller's fault. Just remember that if you bought them in another iteration and they ended up being half a size too small, now order the correct size.