The sizing on MBTs seems across the board. Previous MBT's that I ordered in a size 41 are snug.  So I ordered these and another pair in 42 and they are too big, especially in the heel. These ones being monstrously large. I was swimming in them so much they looked like I was wearing my dad's shoes, and seemed to even grow bigger in front of my eyes in the few minutes that I wore them. Its possibly they were returned shoes and already stretched out a bit.