Do not buy this if you have any mobility issues or are putting on top of a memory foam mattress. Even if it’s a firm one! It instantly creates a depression that makes you feel stuck in a trough. Pillow ends up too high once you’ve sunk in. Impossible to roll over readily, much less engage in intimate activities. I was trying to replace an old egg crate topper and it is so much worse. I’ve tried it for a week and am pulling it off. Only fit for a soft pad under my daughter’s gymnastics bar.