Hi NMmattresssearch,
You can read a little more about “so called” proprietary materials and using this as a justification for not disclosing what I would consider to be essential information here and here and here.
While I can certainly understand that “comfort specs” such as ILD would legitimately be proprietary because they aren’t particularly useful or necessary to know (your testing will give you all the information you need about whether a mattress is either soft or firm enough and is a good match for you in terms of PPP) and there is also other information that would be legitimately proprietary as well such as the names of their component or foam suppliers, the quality specs of a mattress (including the density of any memory foam or polyfoam layers in a mattress or the type and blend of any latex) are important to know to identify any lower quality and less durable materials in a mattress and are an important part of making meaningful comparisons. I would avoid any mattress where the manufacturer or retailer either can’t or won’t provide them.
Unfortunately without knowing the specifics of the materials inside any mattress (see this article) it isn’t possible for me to make any meaningful comments the quality/durability of the materials inside it or help you assess whether a mattress has any potential “weak links” in the design.
Denver Mattress is completely transparent about the quality/density of the materials inside their mattresses and in general they tend to use higher quality materials than most of the mainstream industry which is one of the reasons that I include them in many of the lists throughout the forum in the areas where they have a store. You can see some comments about the Telluride in post #2 here and post #4 here.
1.8 lb polyfoam is generally a good quality material that wouldn’t be a “weak link” in a mattress and would be suitable for most people that aren’t in higher weight ranges that would benefit from higher density foams (see the guidelines here) but a convoluted foam will also be less durable than a non convoluted layer of the same material so in real life it would be more comparable to a slightly lower density foam.
There is also more about the many variables that can affect the durability and useful life of a mattress relative to different people in post #4 here and the posts it links to.
Having said all of that … 2 years isn’t a very long time and while I would hesitate to purchase any mattress where you can’t find out the quality of the materials inside it (because there are almost always other options available where you can) and I would still make a choice that used the least amount of “unknown” materials possible to reduce the risk of any purchase … both of the manufacturers you are considering tend to use higher quality and more durable materials than their major brand competitors in the industry in the same budget range and if the mattresses you are considering are well inside the comfort/support range that is suitable for you and aren’t already “on the edge” of being too soft so there is “room” for some foam softening before it has a significant effect on you in terms of PPP (see post #2 here), then it’s likely that any of them would still inside the comfort/support range that would be suitable for you to sleep on after only 2 years.
Phoenix