Conventional non-organic mattresses (including those memory form ones) off-gas chemicals to a certain extent.  So it is best to get organic mattresses, just like it is best to eat organic foods.

Usually organic mattresses are quite soft.  But for those who like to sleep organic on very firm mattresses, a few options are available…

Cambay Palmpring – made from Palm Coir (coconut fiber) – some say that it smells a bit like coconut.  But I don’t know.  Never seen it in front of me before.

Benchmark Superfirm from Natural Mattress Store – like sleeping on a slab of wood with a couple of inch of natural latex form on top, which is actually what it is.  Website says “The firmest organic mattress available anywhere”.  If that is too firm, you can purchase additional mattress toppers of varying thickness to adjust your firmness.

Both these types of mattresses does not contain metal coil springs — which is a good thing if you happen to believe in the study about metal coils acting like antennas amplifying the EMF fields around your body as you sleep.

See how EMF affects sleep here.