Hi JannyGoats,
Just for clarity … Brominated fire retardants are not normally used in mattresses and most of them were phased out long ago. Most mattresses use either an inherent fire retardant fabric (viscose /silica is one example), boric acid which is added to fibers such as cotton, or wool to pass the fire regulations. I would also be aware that the presence of wool doesn’t necessarily mean that it’s the only material used to pass the fire regulations. The other issue with cotton futons is that they are quite firm and many people with fibromyalgia may find them too firm to sleep on.
I’m not sure which of your layers you are sensitive to (Talalay and Dunlop have a different smell … see post #2 here) but at least both of them are Oeko-Tex certified so you have some assurance that the smell isn’t harmful. The smell of latex will gradually dissipate over the course of a few weeks to levels that most people don’t notice although some people who are more sensitive may still smell it at very low levels, especially if they are close to it (such as if it’s uncovered) for much longer.
Phoenix