I bought this for my husband for Christmas. He's usually a size 10, well they were too tight. I then ordered him 11 as there are no half sizes. His one foot is slightly larger and fit well but I had to buy some pads for the back of the slipper and he had to fold two of them to fill the gap. 10.5 would be just perfect. The slippers look great but if the size was better he would love them.