I bought these slipper boots to replace some Ugg slippers that had seen one too many days.  I love these slippers.  The size is quite accurate for me.  I wear a 9 and I got the large and they fit fine.  When I put these slippers on my feel just melted into them.  They keep me very warm and cozy.  I can't wait to get home from a long day and put on my Acorn's.  I love love love them.