My father turned 97 years old recently, and I was at a loss for what to get him for a present.  After noticing that his slippers were old and worn, I took a chance and bought him the ACORN Digby Mule.  He was thrilled with this purchase.  They fit perfectly and provide great stability so that he can walk without fear of a mis-step.  He likes them so much that he wears them all day long!