Join Date: Oct 2000
Location: Portland, OR
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Many it not most production boats, even high end, came with 1.8 density foam.
This goes flat when sat upon after about 2 or 3 years of normal use. Looks fine and the upholstery cover may well look like new... but the comfort goes away pretty quickly.
We re-foamed our factory upholstery with 2.6 density, in about 1995, and it still sits without "bottoming out" (pun alert...) and we sleep about 20+ nights on it a year without hip bones contacting the bunk tops.
So do check out the higher density. As to the numbers, our upholstery guy said those were pounds per cubic foot, IIRC.
BTW, the higher density costs a little more but not too much.