Hi storbert,
Polyfoam comes in firmer and softer versions (just like latex) so the firmness of a mattress doesnât have anything to do with the type of materials only the firmness of the material. Softness and firmness also is very subjective and one person may call a mattress firm while someone else may think the same mattress is soft depending on their body weight, sleeping positions, and individual perceptions.
You can read a little more about the different âfeelâ of Dunlop vs Talalay in post #7 here but both of these also come in firmer and softer versions. In the same firmness level (ILD) ⌠most people will âfeelâ Dunlop as being firmer.
You can also read a little more about the differences between a latex hybrid (latex comfort layer over a polyfoam support core) and an all latex mattress in post #2 here.
Higher density polyfoam is more durable than lower density polyfoam but the upper layers or a mattress are the weak link of most mattresses so for most people who donât compress the foam layers much beyond the top layers, slightly lower density in the support layers wonât make a significant difference in durability and can make a good choice in a lower budget mattress. In these cases the performance of âfeelâ of the support layers may be more important than the density and the 1.5 lb foam they use is a high performance foam even though it has a lower density. With higher weights then the density of the polyfoam support layers would play a more important role in the durability of the mattress and would be more important.
If you were in a higher weight range than most and more likely to compress the foam below the latex more deeply then I would consider either their mattresses that use a higher density polyfoam base layer (either on their Brooklyn Bedding site or on the Amazon site) or consider a mattress that used latex in the middle layer as well as the top layerâŚ
Phoenix