Memory foam on top of latex?

[phoenix]

Hi NB,

I posted last year, but ended up deferring my mattress search. I think I’m finally getting to the point where my ~17-year-old mattress needs to go!

Welcome back! You certainly have got your money’s worth out of that old mattress!

Is there any reason why a memory foam topper might NOT be advised on a mattress with a thin layer of latex in the comfort layer (I’m looking at the basic Luma, with 1.5" of medium Talalay as the comfort layer. I’m considering getting adding a 2" topper, probably the Aerus with 4lb density.)

This would really come down to your own personal preference, but there would be no overriding reason to not use a memory foam topper over latex, and I actually compare the benefits/drawbacks of either a memory foam or latex topper in post #2 here.

Is the difference in heat retention really noticeable with the Aerus (4 lb density, 2" thickness) compared to regular memory foam?

Aerus memory foam is designed to be more breathable than the earlier generation of memory foams. You can read more about this here from FXI.
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There have been advances in the newer generation of memory foams overall as compared to “regular” or your 10-15 year old memory foam topper, with more open cells and also larger windows in the cells. This “first improvement wave” of memory foam changes occurred around 2010 with researchers making changes to reactivity, functionality and polyols to create more open-cell structures. As far as if you will feel a difference, that is of course a part of your completed mattress system and how deeply you are sinking into your mattress, but overall this layer should move more air through it than your old topper, but memory foam would still move less air generally than latex or polyfoam.

I think/hope that the basic Luma with a 2" Aerus topper will get me something close to what I’ve got now (but a little better with the pocket coils, and more durable with the latex). I’m planning to have a call with the Luma folks, of course, but am trying to get my thoughts sorted out a bit before then.

Excellent! I’m glad you’ll be taking the time to speak directly with Luma before making a potential purchase. They are very knowledgeable about latex and various combinations (and they’re also site members here, which means that I think highly of them), and they can help you choose a combination that might best suit your needs. I’ll be interested to learn what you decide to do.

Thank you for your help, and for the amazing trove of information you provide!

You’re very welcome!

Phoenix