Fifty years ago I wore two pair of Clark's original desert boots exclusively through high school and college.  They appear simplistically rugged, yet their light weight offers surprising comfort with exceptional durability.  If these are made of the same quality, and they appear to be, you will probably never find a more long-lasting attractive casual shoe.  Some of the reviews address size.  My shoe size is 10M, and I recommend ordering 10M (US) 91/2 (GB).  Both US and GB sizing are used with these shoes as Clarks is headquartered in GB.