Hi reverse,
The specs are sprinkled around the forum in various places (including here) but I think it’s a great idea to have them under a specific heading which will be easier for others to find.
Thank you 
The only change from these specs is that they now use a 1" 50 ILD talalay latex layer for the support stabilization base to replace the polyfoam.
There are also a few other models that I don’t have the accurate specs for (some of which are very new) and as I discover them (PLB is not as forthcoming any longer) I will also add them to this thread to keep them all in one place.
Phoenix
NOTE ADDED: These specs are for the “second” version of the PLB Natural line (since they replaced the 1" polyfoam base layer with very firm Talalay).
They now have a 3rd version which uses Active Fusion fast response latex in the top layer (what used to be called Celsion) and the 1" layer on the bottom has been added to the second layer of all the models in the lineup except for the Pamper where the top layer is now a 2" Active Fusion layer. The ILD’s may also have changed as well although I suspect they are similar.