I purchased 3 of these for an upcoming trip.  In previous years, I had owned some SCUBA diving boots I used for swimming in rocky rivers and was looking for a product along those lines but more comfortable.  I had expected a thinner sole on these, but also expected some slight rigidity or form and light/moderate protection on the soles.

I opened one of the packages (my size) and tried it on.  I wear a size 10.5 EEE dress shoe and frequently wear a size 11 sneaker.  The size 11 (mens) on these ran very slightly big.

These were a lot thinned than I had expected on the sides, but that wasn't much of a concern.  The soles are a very soft plyable rubber, which was my primary concern.  Before my purchase, I saw another review with a picture showing the bottoms worn through - but I had chalked it up to kids running around the pool on concrete all day.  After receiving and feeling this material, I would imagine the bottoms could wear through quite easily from moderate one day use.  Additionally, they do not provide adequate protection if walking on rocks and they would be eaten alive by gravel quickly.  The side material is a woven polyester that seems of good quality, but without a better sole I don't see value in this product.

The best way to imagine this product is basically as a sock, and the bottoms provide slightly more protection than a sock but will wear through as quickly as a sock.  I gave it 2 stars instead of 1, because there may be applications for this such as on a sandy beach or treading water, but I don't see many other applications.