This says memory foam....but it doesn't act like any memory foam I've ever owned. You know how when you press your hand into the topper, and your hand print slowly fades as the foam goes back into shape? This doesn't. It might be due to the four pound density, but that's a thin explanation. The only reason I don't ask for a refund is that it's for the camper, and we leave tomorrow. I would say, find a 3" with 3 pound density.