Good price, good item. It is a straight tube design that is closed at the end, so there is no heel area and therefore no contoured foot part. Only little problem was that it was packaged while tuned inside out (typical Chinese stuff!?!), so you first need to fumble with it in order to turn it the right way around. For anyone wondering: It stretches just enough to fit over chubby legs on a 180cm person.
One Size doesn't really fit all. Not accurate. Should have included max waist size in the listing.