New in Box! Replace your innerspring sofa mattress with Classic Brands Memory Foam 4.5-Inch Sofa Bed Replacement Mattress. It easily folds into most standard fold-out sofa beds and it maintains its original shape, so you and your guests can rest easily. Memory foam offers comfort and support. Upgrade your Sleeper Sofa Bed mattress with the Classic Brands Memory Foam Sofa Bed Mattress. The 4.5-inch sofa bed mattress is comprised of 2 layers of memory foam, the top layer of plush memory foam provides plush comfort and pressure relief and the bottom layer of dense foam provides support and ensures the longevity of the sofa mattress. Memory foam reacts to body heat and conforms to the body's curves, aligning the spine during sleep. This mattress will fold up inside your sofa and unfold as easily as a spring sofa mattress would. You could also use this sofa mattress as a bunk bed mattress, a boat mattress, an RV mattress or even as a mattress topper.