The 7-Zone orthopedic mattress supports the spine in a natural, comfortable position promoting a healthy blood circulation. Eliminating excess body pressure, back or shoulder pain problems permanently. This 7-Zone orthopedic mattress offers support and correct alignment for people of varying heights. It benefits 7 body zones namely: Head & Neck Zone Shoulder & Upper Back Zone Lumbar Zone Pelvic Zone Lower leg zone & knee zone Foot & Ankle zone