I ordered the same size I wear in shoes (10.5) and they were a little tight at first but broke in within 2 hours of use. Now that I have put them through their paces... these slippers are perfect. They are warm, comfortable, and rugged at the same time. My moms car ran out of gas and I unexpectedly had to push her car from the side of the road to our house which luckily was only 150 yards. I was wearing these slippers while pushing and they held up to the task astonishingly well. GREAT SLIPPERS!