I bought this for the sleeper sofa in our rental condo to replace the aweful pile of springs and wires that someone had called a mattress. My hope was that the renter would not have a terrible experience should that have to use the sleeper sofa but, honestly, how effective could 4.5 inches of foam be when up against those horrible springs in the frame. Well, I slept on it and was simply blown away. Not only did I not feel a single spring, it was like sleeping on a much thicker and very high quality mattress. Simply amazing!