I was a little worried that this medium size would be too narrow for me as I have very wide feet with a high arch but they fit fine. I agree that they run just a tad large.  The size is 6 1/2 to 7 1/2.  I usually wear a 7 wide - these do fit but with some length to spare so they would be large enough for someone who needs a 7 1/2.  Someone who wears 6 1/2 could probably wear them OK with socks.

They are better looking than I expected.  The color is a rich silvery grey and the fur is soft with a slight sheen.
They are also very comfortable, though not quite as much as the Acorn spa slippers they are replacing - however they are nicer looking.  I can wear them around the house with my jeans.