I'm size 9 and ordered size 9 and they fit good.  Crocs are always a little loose buy not by much. My wife makes me take off my shoes when I come in the house and can be a pain but not with my new Crocs!  I don't even need to bend over to put them on.  I wear them every where, even when I'm 4 wheeling in the side by side RZR or the Honda.  Don't weld with them on tho, the welding slag drops thru the holes and burns your foot!  I love them!