Six-inch high medical grade urethane air chambers support the Air-Pedic 600. There are 6 of these chambers, three on each side of the bed. Air pressure is adjusted differently for the upper, middle and lower sections of a sleeper's body for proper spinal support. According to Selectabed, "Until now, your Airbed could only be adjusted for firmness, not support. With our new innovative zone technology, you have the ability to adjust a lumbar zone to add low back support like you can in some automobiles. This offers a truly supportive and individually customizable system for your body!"
These are dual mattress airbeds, with separate air support systems for the right and left sides of the bed. The center support, according to the manufacturer, is "indiscernible."
The 11½" high Air-Pedic 600 has a 2" thick layer of Flex-Comfort™ foam atop the 2" Flex-Support foam. This added inch makes the 600 a little less firm than the 400. Like the 400, the 600 has the quilted Kool FlowMicro-vented knit cover.