We've had a latex-hybrid mattress for well over ten years now. The latex foam is similar to memory foam, yet it breathes so you don't wake up drenched in sweat, and the steel coils provide support. A cotton-wool comforter also helps.
They aren't cheap, but they last longer than a traditional mattress.
Even better, most latex-hybrid mattresses are made from natural biodegradable materials (latex, cotton, wool, wood), which is my main motivation for paying a bit more. I'm not really worried about "chemicals" as much as not wanting to discard of a mattress in ~10 years that is going to take thousands of years to biodegrade.
We've just ordered a replacement mattress from
Avocado, will soon find out what it's like to sleep on.