That is part of the problem.
Jim:That is part of the problem with regular foam. What we need to know is what weight/density of foam is going to be comfortable, provide adequate support, not cause your arms to go to sleep while you are sleeping etc. One of the differences is that there is NO box spring. We place this on a solid surface which will make a big difference. I had new foam put in our vberth a couple of seasons ago and we are not happy with it. The wife complains, the dog complains (but still sleeps there) and I complain to all the above and you too.I is a good investment if it is done correctly so I want to do it only once (if possible). Using traditional foam is NOT one of our options. The exception to this would be to use a denser foam on the bottom and a softer foam on top.