Going on our 12th season with a 2 inch thick Walmart memory foam topper over the standard Hunter
bedding and it is extremely comfortable. We sleep as good or better on the boat as we do at home. Our bed
is Standard queen size, so didn't need any trimming. We use fitted sheets
for the lower sheet and the corners fit over the topper and the bottom cushions
(4"). I think we have flipped it a few times just to refresh it. No mildew or mold
, but when we are on the boat we use HVAC
(heat pump) full time when at dock
or out sailing/cruising so humidity buildup is not an issue throughout the boat.