OK so far.  Very thin, but seems to be holding up well.
OK so far.  Only problem is that it is very difficult to put on socks without it rolling up.  I am actually misusing it to keep a thicker heel protector in place.  I have a pair of shoes that are great for the inflamed tendons in bottom of my feet, but tear a hole in heels.  These are not thick enough to protect my heel from these shoes by itself, but would probably be OK for normal shoes.
Rating: 4 stars