I gave 4 start, because sizing is off, my first pair was size 5-6, because reviews said, runs large and wide, and size 5-6 was perfectly snug, but i wanted something a bit looser to put with warm sock on my feet. So,I had to exchange for the next only available size 6.5-7.5, and all I need it is just size 7,but seems  Acorn does not produce sizes like this, only in between or larger.
Exchange pair arrived quickly, my feet warm and comfy, I'm happy for now, while slippers new and not streched out, because then it will become even more larger...