The fit is large, I wear a 14 1/2 on certain brands, 15 on others. I ordered these in size 15 and they are large and wide on my feet. Initially I thought these were the most comfortable shoes I have ever worn, and the memory foam definitely works well. When I took these out hiking, however I found the problems with these shoes: first, hiking created a great deal of friction to my feet, causing them to get very very warm, almost hot. Second, the fabric that covers the memory foam likes to roll when the foam compresses, which feels exactly like you have a small stone in your shoe. The solution I decided on was to add a Dr. Scholl's insert to the bottom of these, which made them much more comfortable for hiking, and only a bit less comfortable for standing in.