These shoes are beyond comfortable. I am usually an 8.5 but sometimes need a 9. I decided to go with the 8.5 because others said that they stretch a little. They basically stretched and molded to my feet. I wear them all of the time. They are so comfortable! I bought the gray, which is very versatile. I want to buy more pairs of different colors! The back stitching does rub the heel a little, but not enough to be uncomfortable.