Many modern mattresses are designed to be on a firm yet breathable foundation. At our store most customers place their mattress on a platform style frame. A good platform frame will have sturdy stats with stat spacing between 1.5" and 3". Frames larger than a full size should have a least one center support. We have a great selection of frames-check out the bedroom furniture tab. If your frame has space for a "box spring" your new mattress will need a box for height and support. Each mattress manufacturer makes their own box which can be used with their mattress. These "boxes" are simply a box with slats-no springs are necessary. A "box spring" foundation will change the feel of your mattress and could void the warranty of some products. The exception for this is Vispring. Vispring manufacturers their own traditional box springs (divan) which can mate with various models.