That's right, our belief is that you won't need to now replace your sagging (or too hard) mattress.And on that issue, if you were thinking about a new Memory Foam mattress at great expense, then don't ... purchase three of four of our mattress toppers, put one on top of the other, and you've got yourself a new Memory mattress for a third of the price of the full Memory mattress you'll buy at the retail stores. How about that!