A little stiff, and a little too tall in the heal ankle area.  The top of the slipper is right up against the ankle bones.  Good soles, good for a trip to the mailbox if you forget.  Fuzzy on the inside, felted wool on the outside.  If your feet are warm going in these are nice, if you are cold then you stay cold, but that seems to be on par for most slippers.  An adjustment to the hole to a more sculpted shape that drops below the ankle would make these a lot more comfortable.