I originally ordered a size 8 (my normal size). They fit quite well with thin socks or barefoot but as I prefer to wear thick socks with winter boots, I did return them for a size larger (9).  The 9 is a bit big with regular socks but perfect with the thick ones.  The bigger size feels a bit clunky feeling for me to walk in and tighter around my lower calf than I would prefer, but the opening is somewhat adjustable and they are fairly easy to get on and off. I do have larger calves. They are surprisingly light for having the rubber top on the toe box.  These boots appear to be very well made and durable.  In my two hour trial around the house, they did keep my feet quite toasty.  Although we don't have snow often, I still need a good warm pair to go out sledding and playing.(Still a kid at heart.) I have not yet had a chance to try them out in the snow yet.  Will update my review after that.