Latex foam. When we replaced our innerspring mattress a couple of years ago, we struggled with going with either latex foam or another innerspring. After a couple of years living aboard
... no regrets the the latex... in fact it is more comfortable than our previous 'land based' bed
. The foam does not support mold
growth... which is great for on a boat. We place a memory foam pad (one with lots of small holes in it for a bit of ventilation) and a standard mattress cover over that.
Our mattress sits on top of a vented pad, but during a winter in San Francisco
, we were plagued with condensation
and wet bedding. Our solution: line the hull
around the mattess with the silver insulation
(rolls available from any home improvement center) and then place 'dry dek' between the hull
and bedding.... therefore allowing ventilation all the way around, insulation
to control condensaton, and bedding not in contact with anything except the drydek and mattress. It worked for us.
You can purchase
the latex foam from several suppliers, or have a mattress made to your specs. I'm sure that there are many comfortable innerspring mattresses... but for us: latex foam.