Memory foam In Comfort Layer

[phoenix]

Hi goldem

OK … I understand.

The idea of guideline #4 is to make sure that there is no more than “about an inch or so” of lower quality or unknown quality materials in the comfort layers and quilting layers combined because they could become the weak link of a mattress.

The “or so” is to take into account that if a mattress has 1.5" of lower quality/density or unknown materials in the comfort and quilting layers combined (and quilting can make a material more durable because it pre-compresses it) that it doesn’t suddenly cross a line into being “bad” but once you reach about 2" in the quilting and comfort layers combined then I would want to know the density/quality of any polyfoam or memory foam to make sure it was higher quality/density than the guidelines.

These are just the simple version which for most people would be fine but there is more about the many factors that can affect the relative durability and useful life of a mattress in post #4 here.

Higher quality/density materials can be as thick as they need to be to be a good match for you in terms of PPP.

Based on the reply, I think it was intended to read as “if you have more than an inch of memory foam which is < 4.0 lbs the quality will not be as good.” Is that more correct?

This wouldn’t be quite as accurate or inclusive as the way I wanted it to read and how it’s currently worded but it has the same overall sense yes (except it doesn’t include polyfoam or have a little less exact thickness).

With the layered question, I’m asking what the combination of various layers should produce in terms of comfort layer distribution (since the combination scenarios for latex, memory foam and fibers seems like a grouping of everything in one bunch). I understand combined thin layers of latex can produce different results, and I’m trying to understand where product combinations fit together so I can understand when trying to compare between vendors (such as are multiple latex layers comparable to a latex layer and a foam layer, etc.). I understand this may not be possible without actually touching and experiencing, but I was hoping there was a general rule of thumb which would explain what to expect when materials are layered in combination such as a natural fiber with foam being more or less firm than foam with latex, latex with natural fiber, etc.

These are all questions about what I call PPP rather than the quality of the materials and are much more subjective and relative to each person. They can only be answered by testing a mattress or with your own personal experience except in very generic terms (see mattress firmness/comfort levels in post #2 here).

Phoenix