Bests & Worsts Reviews from Amazon

This was advertised as appropriate for adults. However, It simply isn't thick enough or large enough for an adult to use. Because of its thinness (or other defects), it immediately sinks when an average size adult places any weight or pressure on it. Thus, if one is using it to practice various swimming strokes (as advertised), but the device immediately sinks when an adult puts any pressure on it, how is this functional--or of any use? If you weigh more than 120 lbs, I would strongly discourage you from purchasing this item. It will not be of any use to you in a swimming pool. Honestly, none whatsoever! So disappointed in this product and the company who misrepresented it.