This is NOT memory foam.
The foam in this product is not nearly as dense as memory foam you may experience in memory-foam pillows or mattresses or other products. It is too easily compressed.
That said, I tried the product and it seems to work well for me. I am sleeping better, but it was not what I expected nor what it was promoted to be.
Owing to the waterproof nature of the cover, this product can make for a slightly sweaty experience unless you cool the room adequately.