Hi Djehuty,
As far as I know the covers are Outlast which has a phase change gel in the fabric which will add one more component to temperature regulation. If there was a gel foam quilted to the cover then I would want to know the thickness and if it was over around an inch or so then I would also want to know the density but I don’t believe that’s the case here.
I would confirm that the more costly mattress was the same total height just to make sure that there isn’t a missing layer in the description because I can see no reason why a mattress that has the same materials in the same layer thicknesses has a $500 difference if the only difference is the ILD of the latex. That just makes no sense to me.
If you are tall and heavy I would probably be leaning to slightly firmer over slightly softer and a little more latex rather than a little less but that would also mean the mattress that is $500 more so I would make some careful value comparisons with mattresses that are similar and use that as a tool for “making an offer” (you can read more here about “negotiating” in post #6 here). I’m not sure which size you are looking at (which affects cost of course) but an example is this mattress which uses 6" of latex on top of 7" of 2.17 lb polyfoam and has wool in the quilting and in king size is about the same as the Restonic with 2" of latex and less than the other two options you are looking at. This would give you some negotiating “ammunition”.
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Phoenix