Hi sweetandsourkiwi,
Oh yes, Posh and Lavish, that’s great you were able to find some to see in the retail showroom. Here is a post about Posh+…but does not have the exact specifications - Phoenix post#2
P+L has definitely made a concerted effort to “Not” publish specifications, as I am sure they believe it is best for the P&L retail partners. In 2016, most information I saw showed the toppers and top layers were Talalay latex and the cores in the “all-latex” mattresses had a 6" Dunlop process core. When Kurt Ling and Talalay Global created the Pure LatexBliss it was all Talalay (cores and toppers), then Kurt started his own brand …P+L. The line was always 6" core, not two 3" pieces, Luma believes in this base construction for all latex also.
Talalay 19ILD is probably a good guess on the toppers, the original toppers for PLB were 14 and 19 ILD. Regarding your comment about Luma Sleep hybrid mattress, one of our trusted members, seems to be very similar…of course please discuss with Luma as every mattress is different…but you have enough knowledge in latex to be able to to make educated choices. If I see the specs somewhere else, I will update the forum.
Thanks
Sensei