I had to take out the removable foam liners that they came with to make more space for my feet, but once I did they fit perfectly.  Plenty of wiggle room for my toes, snug around the ankles, and they've kept my feet warm in the few days of walking around that I've done so far.  I'm a size 10 in sneakers and I ordered a 10.5, and like I said they were too tight with the liners but without them there was plenty of room... nice value overall.