I'm normally a 9, but I have thick feet and calves, so I got the 9W in these and they fit great with thick or thin socks.  I had to get the top of the leather stretched a little because they don't flare too much.  I have 16" calves.  After stretching, they fit great, although I wish they went up higher.  They hit at the widest part of my calf, well below my knee (I'm 5'8").  The material is water resistant and sort of suede looking.  Overall, a comfortable, versatile, high quality boot.