I have a bad back and the only shoes that are fully comfortable are the Fit Flops.  I have sandals and clogs but have never owned a proper pair of winter boots that didn't hurt my back.  I was a little nervous after reading reviews on these boots about sizing.  I am heavier set and thought if these people can't get their feet in the boot I sure hope I can!  I ordered my regular size 9 and am so happy with the fit and comfort of these boots. I think I am going to go find cold weather just so I can wear them!!