I normally wear a size 9 in women's shoes but bought these in an 8 since I read that they run small. The size 8 slippers were still very tight. I suppose they will stretch out and they are very warm and cushiony on the inside. It seems like they may run small because of all the cushioning in them so I am guessing that when the cushioning wears down after a little use, they will not be as tight. They also look very nice and have a nice durable bottom so they can be worn outside. My husband saw them and wanted a pair for himself, but he normally wears a size 13 and I wouldn't know what size to order for him even if they made a size that large!