Phoenix,
I was testing several of the PLB mattresses today, including the “Sustain” model, comparing it with 11" and thinner PLB models. In this thread, you suggested that the “Sustain” has two 2’ layers of N1, but in post #2 here, you suggest that N1 natural latex from LI has an ILD range of 14-19, the same as you listed for N2, which I assume is a typo. The odd thing is, for me the “Sustain” seemed noticeably firmer than the other PLB mattresses (except for the “pamper”) even though those other mattresses have significantly less soft top layers.
Now, I know you’ve said in multiple threads that people feel mattresses differently and that there are a number of different factors determining how firm a mattress feels. I’m wondering to what extent this could be due to the lack of of the GL (ActiveFusion) foam in the all-Natural PLB mattresses or if something else is in play here. Obviously, the “Sustain” also has a significantly different cover than the standard PLB offerings.
Thanks