Shopping for memory foam adjustable beds? Here are some tips to help you find a good one. First off, your body’s shape, weight, and height factor in the selection process. Height is important, because the taller you are, the more dispersed your weight will be on the mattress. A box spring is not needed when you buy a good foam mattress. Instead, the mattress you buy is usually placed on a platform. If you’re replacing a conventional mattress with memory foam but not replacing your box spring, put plywood on top of the box spring to provide a stiffer surface and better support. When you have affordability in mind, you might want to consider a memory foam bed mattress topper. You can put this slab of foam on top of your mattress for better support.