Because my feet seemed to have "spread out" over the past few decades, and I am right on the cusp between a 9 and a 9.5, I originally ordered these in a 9.5.  I have found that casual shoes - especially hiking or atheletic shoes - seem to run a bit small and thought I wanted sufficient room in the toe box of the Clarks.  Well, the Clarks run absolutely true to American sizes, and I had to send back the original 9.5 pair to Amazon and then order the replacement size 9 pair from Clarks themselves, as that size just does not seem available through Amazon.  Too bad, because getting them from Clarks cost me another $25.  All of that hassel notwithstanding, these are great shoes/boots, and I highly recommend them.  There's a reason that they are still around after all these years.