For reference, I am female, 130lbs, as I believe this may be relevant to how mattress toppers are perceived.
FALSE ADVERTISING. I will be returning this item immediately and I'm genuinely angry that I went through all this trouble to have nothing to sleep on tonight. this is advertised as 4 inches of memory foam. It is neither of those things. Any old piece of foam is not "memory foam" and this doesn't hold shape for even a split second. It is clearly just a piece of cheap foam with a HALF INCH layer of "cooling memory foam" on top. Absolutely disgusting false advertisement and completely inappropriate for the price point, because at this price point you can get other actual memory foam toppers which is what I expected this to be based on its own description!
Realistically all you are paying for is the nice looking cover with straps that it comes in. The foam is an absolute cheap piece of garbage, %26 based on quality it will give out quickly. It is incredibly soft far too soft for anyone actually seeking memory foam to sleep on. Memory foam means a level of firmness and hold. I wouldn't sleep on this or put a guest on it, for fear they'd wake up in terrible pain.
As it is, I am unable to sleep on this mattress topper and have to put something on top of it just to survive the night. As a person with a neurological disability sleep is vital and I made a point of purchasing what advertised itself as a memory foam topper only to discover they have made the cheapest item possible to try to pass it off as the real thing. This is part of the gross decline in product quality across the board. Do not buy, you'll regret it.