Best Memory Foam Pads
If you’d rather use a memory mattress pad to save money, rather than buying a complete (and usually expensive) mattress, it may be possible to do that. But you’ll need to be sure that the underlying mattress is quite flat without dips in it (or a “hammock” area in the middle), and neither extremely soft nor hard. If it meets those conditions, the same concerns about density and thickness would apply to the memory mattress pad topper. But with a good, supportive underlying mattress, a memory foam topper can serve you as well as a full mattress would.
As always, when spending the sort of money you’ll be shelling out for a big product like this, you need to do as much research as possible. Check into the manufacturers of the products, to discover if any major complaints have been voiced about them. If the maker is well-known and has a good reputation, that can add to all the other factors you consider, and you can buy your new mattress with confidence.