This are nice boots. However, I had to return them. Following others advise, I bought 1/2 size up.  I usally wear 8 1/2 and bought a 9; they are medium width.  The boots fit fine except the "duck" part that runs across the top of toes was too tight - with only a very thin pair of socks.  After only a couple of minutes my feet hurt. The search continues.