I bought this shoe and then read a lone review that stated that one will be fine if they go one size larger when ordering. I wear an 11 4E and I ordered it just as that, and am THRILLED. The bonus is that even my custom orthotic fits very well inside these shoes. They feel great and are a much better walking and running option in the cold Upper Peninsula of Michigan winters. A nice waterproof toe coverage and great soles. Still slippery on ice, but then again, everything is. With a pair of ''Get a Grip" 's I think I'll be just fine! :) Great shoe and I got them at a great bargain. In fact I loved them so much that I immediately ordered a 2nd pair for when I want them replaced!