After having an eggtop memory foam topper, and having to return it reluctantly due to a large whole in it, I was disappointed that the store where it was purchased, no longer sold it. After searching many websites, I finally hit upon the Serta 4" memory foam topper. It came in record time, and I am very pleased with it. I suffer from back pain and this topper allows me to have a good nites sleep. It is rather large being 4" high, and the sheets that I have are not large enough to fit both the topper and my mattress completely. I would recommend purchasing the 3" topper. As for comfort, you can't get any better than this unless you plan on spending a lot more on a pillowtop mattress.