I've worn these slippers for 3 years..  I agree that they run small so order a size up.  They also require a "break in period".  At first they're tight because of the shearling and the foam sole is stiff, but they soon loosen up, mold to your feet, and get heavenly.  :D  I wear mine around the house constantly, and outside for quick errands and the occasional dog walk.  For slippers I would classify that as heavy use.  After about 18 months on average they're pretty worn, but still perfectly functional.  I haven't actually worn a pair out yet but I've had to replace them because the dog got to them :(.  Regardless, they're far and away the best slippers I've ever had.  The only replacement for my Bearpaws is another pair of Bearpaws.