Manufacturer's Description (SleepLogic):
"The Atmospheres sleep system represents a revolutionary new generation of air products that truly take the air mattress to a new level of comfort and support. In addition to allowing you to adjust your own comfort level (like other air mattresses), our new Atmospheres 3-Zone mattresses allows you to separately adjust the center (or lumbar) section of your mattress for adjustable back support to help reduce and relieve back pain .
The center or lumbar area can be independently adjusted to one of 65 firmness levels to provide you with the ideal level of back support for your body type, weight and back needs. You can also adjust the firmness levels of the head and foot sections of your mattress (from extremely soft to extremely hard) to meet your own individual comfort needs."