I wear a 7.5 AA shoe.  After finding that "my" old favorite ballerina slipper, Isotoners, has changed  , and a Size M is now too small, while a L is too big, I tried this brand.  Same problem!  But at least the Size M is just a LITTLE too small, so I am hoping it will stretch. The suede soles seem thinner and less durable than the Isotoner soles (but at least they are suede).  And they certainly are a better price than Isotoners.