Disclosed are apparatus and methodology for an adjustable width foam mattresswhich involves the use of modified lateral or side edges of an engineered foammattress.Such lateral portions include collapsible structures for lateral adjustment ofthe overallwidth of the mattress. While different shapes are possible, one exemplaryarrangementincludes plural elongated octagonally-shaped openings. The long sides of suchelongated structures form stops against each other as they fill the void ofthe opening.The relatively shorter sides of such structures articulate during collapse toaccommodatesuch movement. As a result, and as the long sides fill in voids, the supportstructureessentially switches uniformly from one density to another, when moved fromitsexpanded to its compressed position. An inflatable/deflatable member may beused toassist with expansion and compression of a lateral support structure.
