Five specialized contour zones are created through heavier guard coils and increased coil concentration in specific body areas. Our 5 zone individually pocketed spring comprise a greater concentration of springs at the vital center third of the mattress, i.e. Spine area, providing extra support where your body is the heaviest. It conforms to your natural curves, supports concave areas such as your lower back, as well as your spine and body in a natural position while you sleep.