Hi 2manybeds,
I would want to know the density of the polyfoam core as well for comparison purposes (soy based foam isn’t actually “soy based” as you can see in post #2 here) although it won’t be a weak link in the mattress with 6" of foam above it.
I would be more cautious with the 2" quilting layer on top of the mattress which also doesn’t include the density and is in the top 5" or 6" of the mattress where the durability of the materials is a more important issue. The quilting would make it more durable than a “loose layer” but once you have 2" or more of lower density and less durable materials in the comfort layers I would want to know the density of that as well (see the guidelines in post #4 here) because 2" is “on the edge” of being a potential weak link that could affect some people (especially if they were heavier or their weight was less evenly distributed). The rest of the comfort layers are all good quality materials (2 lb density polyfoam and Talalay latex) but I would also keep in mind that 2 lb polyfoam isn’t as durable as latex and it’s also a lower cost material.
The Luxurion for example uses 1.5" in the quilting and then has 6" of latex under that although I believe it’s only available locally. Their Roma two sided mattress and their Special (which can be customized before and after a purchase) can both be shipped across the country.
The Brooklyn Bedding latex hybrid options (the Perfect Top series) are here and they use either 3" of blended Talalay latex or in the case of the Alexis there are two 3" layers of Talalay latex in the top of the mattress. The latex layers in all of these can also be customized both before and after a purchase.
The Rocky Mountain Mattress Rendevous or Cloud Croft are both memory foam mattresses (although both of them use latex in either the transition or support layers) so they would be an “apples to oranges” comparison with a mattress that has latex comfort layers although neither of these have any “weak links” either. These would be more suitable for those who preferred to sleep on memory foam comfort layers vs latex.
Phoenix