The GS.900™ comes with the Comfortaire unique patented box-top design. The 3.5" air cushion can mold to any body shape, allowing the back to relax in comfort. The special 6" base foam provides support for proper postural alignment, and the bed comes with 100 memory settings that let you determine your preferred level of firmness.
From ComfortaireBox-Top Aire Air Bed from Comfortaire
From Abe Abbas, About.com
As you can see this air bed looks much like a traditional innerspring mattress, but it has air chambers instead of springs.
Box-Top Aire from Comfortaire
Photo (c) ComfortaireSuggested Reading
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