My 91 yr. old father-in-law said he needed a new pair of opera slippers because his old ones were wearing out.  Said he liked opera slippers because they were easy to put on.  Said his size was 9 1/2 D, which is what I ordered.  He got them within a week, and said they fit fine, just what he wanted.  I had ordered these because they did not have leather soles.  I personally have had a problem with leather soles on slippers, because they were too slippery on carpeting.  Not good if you have carpeted stairs.  Don't want him to fall down.