Hi If It Wasnt For the Foam,
[quote]I love the top layer of my S&F - it is cashmere with I believe 1.5" polyurethane foam and some wool or other fiber for temperature regulation, and all tufted together. I just love it. My mom recently got an S&F pillow top and it is unbelievably comfortable (my perfect bed!). It is the same bed, just pillow top.
Anyway, want to get more foam. I was thinking I would do one layer of latex (medium?) for the main comfort layer, and I started thinking I would use polyurethane and fibers for the top layer. But then why not use more latex? So maybe I’ll do 1" soft latex with fiber, tufted together with a killer fabric 
I could do a 2" base comfort layer but this would be getting expensive, and I feel like I can always add another 1" under whatever it is I make.
I would love to hear your thoughts about what materials to use for the quilt and tufting, and if anyone has experience or thoughts about using only 1" comfort layer with the added 1" in the top layer.[/quote]
Stearns & Foster (Sealy) don’t provide the information you would need to be able to “match” the feel and performance of their mattresses or even their top layers and I would also be aware that all the layers and components of a sleeping system (mattress plus topper) will affect all the other layers and components and the “sleeping system” as a whole and since your mattress would have different layers and components under the topper than the layers that are under the pillowtop in your mom’s mattress it’s unlikely that you would be able to “match” it based on specs anyway even if you were able to find them out.
When you are looking at these types of very complex combinations there are too many unknowns and variables to be able to predict how they will feel for you based on specs (either yours or a mattress/topper combination) and the only way to know whether any combination of toppers will “match” the feel you are looking for on your particular mattress will be through trial and error and your own personal experience.
I would tend to keep things much more simple and if I had to guess I would say that your closest “approximation” may be a latex topper with a wool topper on top of it so you would be sleeping on the “feel” of wool with the softness and resilience of the latex underneath it.
Because you won’t know the thickness or firmness of the latex or the thickness of the wool topper that would come closest in combination with each other without actually trying it … the return or exchange options of the latex and wool toppers may be one of the most important parts of your purchase so that you can reduce the risk of being “stuck” with your toppers if you end up choosing a combination that doesn’t doesn’t turn out as well as you hoped for.
If you do decide to go in this direction then post #2 here and the topper guidelines it links to can help you use your sleeping experience on the mattress as a guideline to choose the type, firmness, and thickness for a single topper that would have the best chance of success in terms of PPP and includes a link to the better online sources for toppers I’m aware of. There is also more about wool toppers in post #8 here and the posts it links to which also includes a link to a list of the better sources for wool toppers I’m aware of as well.
Phoenix