Hi bobfrog,
You can see the specs of the PLB Nature and Beautiful in post #2 here. They are correct though that the ILD of different types and blends of latex don’t correspond to each other very well (see post #6 here). Every layer and component in a mattress (including the cover and any quilting materials) will affect the feel and performance of every other layer both above and below it and there are so many different “specs” that will affect the feel and performance of a mattress that combine together as part of the overall design of a mattress and that makes one mattress suitable for one person and not another that ILD by itself can be somewhat misleading because it isn’t the only specification that determines the feel and performance or firmness level of a mattress (see post #2 here). Having said that … testing these mattresses can certainly give you a better sense of how you feel about latex in more general terms and can give you some idea of whether you tend to prefer or do best with softer or firmer latex mattresses in terms of PPP.
This is a blended Talalay latex that has phase change gel added to the latex formulation. There is more about Active Fusion Talalay latex in post #5 here and post #2 here.
The Beautiful and the Nature both use Talalay Global’s (which used to be called Latex International) blended Talalay latex which is a blend of about 30% natural latex and 70% synthetic latex … not their 100% natural Talalay.
Phoenix