In reply to Swirly: don't bother swirly, they're guff. i bought a pair as i quite liked the white ones, but these are nothing like them. They are really flat and no-where near as aggressive a design as the original mugen (which wasn't even the most aggressive boot in the first place).
If you really want a pair, i felt mine were roomier than the mugen, and stretched about 1/2 a size.
seriously though. don't buy them.