I’ve looked at mattress toppers for years and thought I don’t need one, my mattress is comfortable enough. Boy, was I wrong! This 4” gel memory foam topper is so comfy, it just conforms to your body. I use to sleep with a knee pillow, but for some reason on this I don’t need it any longer. I love that it has a cover that can be washed and to protect the mattress. The only downside is, it’s really heavy. I have a twin and can barely manage it on my own, but the comfort is worth it.