I had purchased another brand of these that were about 3 times the cost of these and had to return them as they were way too small (in the same size).  I typically wear a 10.5, but ordered slippers in an 11 as I want them to be comfy and to slide easily on and off.

These are very comfortable, however within a week, the fleece lining started to come detached from the interior of the shoe.  The whole layer is peeling off.

They were very low cost, so I am not too disappointed and they are not worth sending back.