First, the Fit is not standard, mainly because it's more narrow than any M. Picture looks like a higher back but actual is less than a 1/4 inch and so useless--cold back of heel of foot. Fur inside slipper unravels easily and looks like compressed cardboard. Nowhere near the grand description on the web page. Over rated slipper. And it's HEAVY for a casual slipper. And, on your feet it looks like a gigantic tadpole or a beached jelly fish. Other than that It's ok. Was able to be Returned, thanks to Amazon's Prime membership.