Memory Hybrid Mattress - The perfect combination of memory foam and innerspring. This mattress has an innovative design that will relieve your back and hips.A memory hybrid mattress is a type of mattress that is made with three or more different materials. These materials, and the way they are put together, provide support and comfort for you. The first material is usually the cushion or pillow top, made of high-grade cotton and fire retardent wool.