I have been looking for soft cushion material that is still soft to sleep on YET will not sock up water like a sponge, like spray or rain what ever, All the soft foam I can find that is comfortable to sleep gets destroyed by water (falls apart when rubbed) and sun light (gets chalky and crumbles). Or works like a giant sponge. I even tried a block of the so called memory form, It is very nice and soft. I put it on a anchor and let to sink to about thirty feet in the river. That was three weeks ago and still I can not get it dry. And even after three washings it still smells like mud. My search of places like goggle have not been fruitful. Does any one know of a COAST GUARD approved floatation foam that is as soft as a mattress, perhaps that would be a better search, But I have looked all over even Home depot for dual purpose foam. Am I asking to much from those chemical engineers. I found several old life Jackets at the flea market, dollar each, and cut them apart to see if they world have anything of value, but that foam is as hard as sleeping on rocks.