Having enjoyed Isotoner slippers for many years, I was sorely disappointed when they changed their sizing/fit several years ago. The package sizing remained the same, however, they decided to "scrimp" on the fabric. Consequently, newly purchased slippers, though well within my known size range, (supposedly through a 10 1/2) still ran short in the toe (I wear a 10), thus far less comfortable. Was I sure...you bet. I still have an ancient pair that when I slip on, are an excellent fit.
No stores carried sizes beyond XL...until I saw these on Amazon. I ordered them in XXL and they really do fit. Re-ordered 2 more pair for each of my daughters (who've had the same problem).
I have to give 4 stars as I've found their overall quality is not quite what it used to be...but at least they fit!