Lay a 3-inch thick slab of latex on the flat surface where the bed will go, such as the floor or bed platform. Latex is available in a variety of firmness levels, so select the one that suits your mattress needs.
Top the layer of latex with a piece of memory foam or eggcrate foam. Lay the foam on top of the latex base. Use a sharp knife to cut the piece of foam so it is the same size as the base.
Lay a mattress topper on the foam layer. You can use cotton, wool or down for a mattress topper.
Cover the layers with a fitted mattress cover. Pull the elastic ends of the cover over the layers and tuck it under the latex slab.