Hi Geoff,from Darwin the muddie capital of the WORLD! I have no experience with memory foam, but I recently had my aft cab mattress replaced. I went with the old fashioned Dunlopillo which we all thought was junk when we were kids....But it is wonderful and just as good as an innerspring. And...I had no trouble in contorting it to get it through the companionway, past the engine room, through the tiny doorway and into the cabin. David.
"if at first you don't succeed....Redefine success"!