My 10 1/2 size feet just barely fit on the foot beds, though "XL" is supposed to fit size 12-13.  Other slippers ordered also ran small.  Misrepresented sizing is a big problem for on line shoppers.  Slipper provides adequate though not great comfort, and is a little tall inside, meaning it will likely be hard to keep from slipping off.  I'll keep them out of desperation and  because I'm already returning another pair (Sorel), but I'm disappointed.