Choosing the right mattress will help you achieve restful sleep and assist in maintaining the natural shape of your spine. Memory foam is considered the best type of mattress due to its ability to contour to the body. It molds to the body and reverts back to its neutral form as soon as the exerted pressure is removed. The 12" Premium Memory Foam Mattress from HoMedics by Sinomax is the highest in sleep comfort with a generous 4.5in of memory foam. This design allows for a more natural air flow while you sleep. .