LOVE these snow boots! Run a little small. I wear anywhere from a 9 to a 10 in Brooks running shoes, and the 9 in this boot was super tight. I ended up getting a 10 because 9 1/2 were out of stock but I have a feeling the 9 1/2 would have been too tight anyway. They are so comfortable! Not as snug around the foot as a tennis shoe, but you don't feel like you're walking around with your foot in a box! So far very warm!