Hi jesshouse,
Welcome to the Mattress Forum!
Iām sorry that you seem to be having some sort of a reaction to your Tempurpedic mattress ā either the covering, polyfoam or memory foam contained within it. Many people are sensitive to polyfoam and specifically memory foam (I once had a similar reaction to a memory foam topper, even though I donāt have Multiple Chemical Sensitivities (MCS)).
The exact chemicals used in the manufacture of specific trademarked foams is a closely held secret by those manufacturers, so thatās not something youād expect to be able to find. I donāt know that Tempurpedic is āone of the worstā, but as the largest memory foam mattress brand I would expect to find the largest number of both complaints and compliments about their products, including from people sensitive to their foams. But to your point, Tempurpedic mattresses are not CertiPUR certified (a minimum I would recommend for any memory foam you might be considering) and unlike many other manufacturers they donāt provide any specific information about any testing they have done for harmful substances or VOCās.
Post #3 here speaks directly to some of your concerns about Tempurpedic mattresses. There are also some very good links in that post regarding more detailed information about āchemical freeā and āsafeā materials in mattresses. Itās a bit to read, as the topic is quite large and thereās āmore than a littleā misinformation out there.
Both Naturepedic and Spink and Edgar use good quality and durable materials across their mattress lines, but they would be very different feels from a memory foam mattress. Naturepedic focuses upon pocketed springs, latex and natural fibers. Spink and Edgar focuses on pocketed springs and natural fibers. Neither brand uses polyfoam or memory foam in their mattresses. The only way youād be able to determine if you enjoyed the feel of these products as compared to your current memory foam mattress would be through your own careful testing and evaluation.
Latex is available in different methods of production (Dunlop and Talalay) and is available in different softnesses (ILDs), so there is a huge variation of how a ālatexā mattress can feel. And an innerspring mattress using latex on top will have a different feel from an all-latex mattress, but neither will feel like memory foam, which has a very low resilience (latex has a higher resilience and many people refer to the feel as ābuoyantā). Naturepedic does offer customization for the left and right side in many of their mattresses. There is some information on comparing latex to memory foam in post #2 here.
If youāre considering staying with some sort of memory foam product, there are some guidelines for purchasing memory foam in post #10 here. There are some other memory foam brand options in post #12 here. Thereās also a bit about how memory foam is made here.
If you have more specific questions Iāll do my best to answer them for you, but I think in this case your best course of action would be to do some testing at your local store of the other options youāre considering, and Iāll be interested in learning what you find out and decide to do.
Phoenix