Reading the reviews before hand was quite helpful in choosing this product for size choice. So I chose a size smaller because it is mainly fabric. It was very snug on my bigger foot and a bit uncomfortable until it loosened up a bit. I am happy with that chose because my smaller foot would be having a difficult time in the boot with too much movement. I bought them for comfort and they are living up to it for now. Hopefully for the life of the boot too. I think everyone should have a pair, like wearing slippers outdoors.