I bought a latex 4" hunk o foam. It is comfy enough. mainly we bought it cuz we did not like the idea of cheap
foam off gassing. "natural ".
In the future I will do what I have done in the past and use many layers of cheap one inch foam, in a canvas
duck cocoon. Cheap one inch foam can get be washed , and air dried easily in a day. If it does not dry in one day, one risks a bad odor
from mold/mildew. The latex cannot be washed, and when we rarely take it out of its' cover, lots of little pieces get all over. It has not become funky, and it has been 5 years aboard the tropics.