Sapapa's Health Center has two main advantages: It provides maximum support to the back and doesn't compromise flexibility and compatibility to the shape of the body. How do we do that? Unlike other processes available in the market, which make the central and most important part of the mattress hard, Sapapa's Health Center is made of flexible steel (others sometimes use Polyurethane, for example). The fact that it is made from the same material the spring system is made of, and that it is placed on top of the springs and not in the middle of a spring entanglement, makes it possess the qualities that really look after your back more that any other mattress. The Health Spine. This platform is made of flexible wooden strips that compliment the spring system and provides support and comfort both when sitting and lying down. The Health Spine also keeps the mattress ventilated. A wide steel frame surrounds the mattress preventing the springs from sinking towards the center and in addition provides flexibility to the edges of the bed and compatibility to the body's shape. The frame provides sturdiness, allows for maximum utilization of the entire sleeping area and protects the bed for many years.