Peter: my foot is 24cm and the boots were always to big for me. I didn't read the BOL how to fit a boot and mondo size instructions, I just believed what the "chart" said where I ordered them.
jetskier: the inside of the shell says 25-27.5, I don't get how these are sized still, as apparent by the fact I bought the wrong size in the first place.
I can say I wear a size 7 in running shoe and a 7.5 in hiking boot and these were big on me. I now have a set of 24 mondo in the track 325's and they fit great. Hope this helps.