Yes, they do run a little narrow! I would prefer a 11.5 but the 11 with normal socks work great for me. But, if you want to wear thicker socks and your feet run wide then be aware. They are keeping my feet extremley warm in 30 degree temps. In fact even with my thin socks if I overdo it by running around in my house, etc. my feet get TOO warm! I got the mushroom color and I am so happy I made the decision to buy these. I have always wanted Uggs but did not want to pay the  high price. These do not have the soft warm fuzzy fur but the quality of these boots are great. I am probably going to get a pair(from Santa) in a different color if they are still available.