Got this to put on my 10" memory foam mattress primarily to make it a bit softer, but also higher (just for aesthetics).  My mattress is a medium-firm and too firm for my shoulder when sleeping on my side.  While this mattress topper did improve my comfort, it's still not as soft as I was hoping for.  Product description claims it has a medium side and a soft side, but I'm using the "soft" side and it still feels medium.  The cooling aspect seems legit; I'm no longer waking up at night due to overheating.