Hi Dangeresque55,
Sorry … I should have looked back in the topic but I believe the specs in your previous post may not have been quite correct (and are a little out of order). While it’s not the case here because I assume that you received the Blue Heaven specs from the manufacturer … specs can also change over time and can also vary from area to area with the different factories that make mattresses for licensee brands and they can sometimes be listed incorrectly on other websites so I always try and make sure that the members here have confirmed the specs in any mattress they are considering from the retailer or manufacturer when they are making the purchase so that they are up to date and so they don’t take anything for granted based on “historical information” or “other sources”.
Having said that … if these are the complete specs of the Blue Heaven (which they most likely are or I believe “should be”) …
2" Talalay Latex
2" EcoGel® Memory Foam - 14 IFD 4 lb density (not 5 lbs)
1" DynaFlow® Cooling Fabric (to provide airflow)
2" High Support Memory Foam - 12 IFD 5 lb density
1" Latex Enhanced Support Foam - 2.0 lb Density 18 IFD
6" High Density Foam Support Core - 1.8 Density 30 IFD
Then there would be no weak links in the mattress. You can also see some comments about it in this video which was recorded by Jeff Scheuer who is one of the members of the site and used to sell them before Therapedic replaced them with a different mattress (at least in his area).
As you know from your testing this would have a different “feel” than an all latex mattress because the top layer of latex would provide a more resilient sleeping surface and more freedom of movement than memory foam but the memory foam would modify the feel of the latex and provide some of the slower response and “feel” of slowly sinking in to the memory foam underneath the more resilient latex. A relatively thin layer of latex over good quality memory foam is a layering combination that many people (including me) like but of course this would be a preference choice based on PPP.
I would also confirm the specs of the Natural Splendor from the manufacturer/retailer because they are different from the specs for the Natural Splendor listed on the Therapedic website here which shows 2.5" of polyfoam on top of the latex and the specs you listed is a latex/polyfoam hybrid not an “all latex model”.
So called “Soy based foam” is just a version of polyurethane foam that has replaced a relatively small portion of one of the two main petrochemicals (the polyol) used to make polyfoam with a polyol that is derived from soy oil (see post #2 here). In terms of their quality/durability … they can be directly compared to regular polyfoam.
Phoenix