I ordered this for a 15-y.o. top of the line Serta mattress set that's in our vacation house. It's seen better days, but I didn't want to spend the money on a new one right now. This topper is fabulous! In fact, it's so great that I ordered another one for my Sleep Number bed that we sleep on every night. It is a good bed, but this topper tweeked it enough that now it's PERFECT!! It feels good to both my husband and myself. Now we feel no pain from sleeping in a bad position. We wake up refreshed and without the little joint pains we were having before. I've bought 4 other memory foam toppers in the past, but this one is THE BEST one I've ever used! You won't be sorry.