I have big (size 13) fat feet (Triple E width) and have always had to order 'wide' shoes... so I rolled the dice when I ordered this men's size 13 "medium" shoe. Not to worry though... the fit is perfect plus even for my very fat feet... and they are the real thing... Crocs. Great buy for the big guy with big feet... only caveat I can think of is that for guys with NARROW feet... a genuine 'D' width or narrower... these folks might find this particular shoe a bit roomy.