I wear womens size 8 to 8-1/2. My Sidi's are the largest kid size they make.
Fit is really good since I'm not swimming in them. With adult sizes even if they weren't too long, there was too much volume inside.My foot felt like it was in a big box. I tried on Alpinestars, MSR's etc. I had the same problem with every brand in the adult sizes.
I got mine a couple of years ago, the kids model at that time has the plastic shell hinged at the ankle, so they are really flexible and easy to walk in and I've got good feel on the shift and brake. Another bennie is that you get the Sidi quality at a much lower price than they charge for adult boots.
-Nevertheless