Hi Mick04u,
This is a fairly standard layering and could work well for a very wide range of people. I would take things from the other direction though because there is such a wide range of variables involved in which mattress may be the best match for which person that I would use personal testing to indicate whether this mattress is a good “match” for any particular person (regardless of their body type, sleeping style, or preferences) because this would be more accurate than any theory. In other words … it’s the best match for someone where it provides the PPP (Pressure relief, Posture and alignment, and Personal preferences) that are “ideal” for that specific person regardless of any “theory”.
If this is a mattress that you are ordering online and haven’t tested this specific combination of layering in person … then the manufacturer will have more detailed information about the specifics of the layers and how the work together with each other, the cover they use, and different types of people in their customer base to be able to use “averages” to give you a good idea of which of the layering combinations they offer you would likely do best with in their experience.
In other words … I wouldn’t try to use theory to define a group of people that may do best with any particular mattress because there are too many variables involved and there will be too wide a range of people in the group. It’s much easier to start with the specifics of the person and in a more detailed conversation with the manufacturer you are working with to choose from a smaller group of potential layering combinations that may work well for you as a starting point in their experience.
You can see a comparison between blended and 100% natural Talalay in post #2 here.
I don’t think it’s possible to give an absolute answer to this type of question because it depends on the answer to each person’s question of “how safe is safe enough for me” nd each person may have a different answer to these types of questions. Post #2 here and the links inside it has much more information about this.
I think a reasonable answer for the large majority of people who would be quite comfortable with the standards and testing protocol used by OekoTex standard 100 class 1 (which is the protocol used to test all the Talalay latex made by both of the major manufacturers that make Talalay latex) is that there wold be no “safety” issues with any type of Talalay latex.
Phoenix