Simply order the actual shoe size where the toes end. I currently use too much of a size 12 while wearing a size 12 and the shoe has room to breathe. his thin rubber slippers spectacular. With them you have time to get used to the body, to wear them you will engage muscles and tendons that are not normally used. Please don't drop this and go jogging. Wear them to class and get used to walking in them or you're likely to injure yourself.