Think this would be a great boot but it is built on a narrow last. I have a few pairs of Mountian Lights where I wear a 9.5EE and they fit like a glove. My Grouse's are 10 EE and fit a tad loose, my 600's are 9.5 EE and are like a glove. I tried a 9.5, 10, and 10.5 and they were all too narrow. Great boot other than that.