Just got these Acorn socks and they are nice and warm and thick and the quality is good; just as I wanted for lounging around BUT the sizing is not so great. I wear a womens size 9.5 wide shoe and bought a 2 pack of size large Acorn socks which is suppose to fit womens 9.5-11/mens 8.5-10.5 according to the label.
Based on a review here from a woman who wears a size 8.5 shoe and bought the size 8.5-9.5 socks and said that this size was just the right length and snugness for her size 8.5 foot and suggested that for anyone who wears 9 or 9.5 they probably would not fit, I decided to go with the size large. The leg part of the socks fit fine but from the arch part of the socks out to the toes are very, very wide. They are 1 inch too long and 1 inch too wide. When I try to walk in them they start to come right off my feet. They would probably fit a womens size 11.
This is why I only give them 3 stars. They will not fit a shoe size 9.5. And I can't return them because the seller (not the same seller in this advertisment on Amazon) does not accept returns for them. Also they are very very slippery on linoleum floors. I wish Acorn had better sizing. The only thing I can do is wear them over top of another pair of socks yet they are still too big but at least they don't come off my feet.