Simon is pretty much on the money if only because a box spring mattress breathes which is something no foam mattress will do.
OTOH if you can't spring at the box mattress, on our previous boat I had berth cushions made up of a layer of very firm high resilient foam with an overlay of very soft HR foam and two layers of Dacron fibre sheeting. I then had the whole thing encased in mattress ticking. 20 years later that mattress is still giving sterling service for the current owner. For an odd shape (e,g v-berth) it slightly more practical than BSM if only beacuse you can still have three separate cushions incudling a removeable filler piece. I used a similar concept for the settee cushions. The great advantage of the Dacron btw is that is gives a measure of breathability.
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"Those are my principles, and if you don't like them... well, I have others." Julius Henry Marx.
Last edited by tdw; 09-11-2007 at 08:00 PM.