My heel does have a little bit of sliding room, but not enough to make me return the shoes. Fit large, minimum cushioning. This pair has been my greatest success to date - coming in a ½ size they fit almost perfectly. One gaming session I started at 100% battery life and after about 4 hrs it was less than 50%. Everything about the phone is perfect for my needs. He has worn LLBean moccasin type slippers for several years and they always stretch out so much that they slap on on the floor, very distracting and unsafe. Charging Cable & airtips quality good. They dont make my ears warm and sweaty. So, I am typically wearing these for 3+ hours at a shot. **EDIT***After almost 2 years is still standing and rock solid.