Thanks for the information. The post you referred to on wool covers was very useful and interesting. In searching for customer reviews of the “Sustain” model I’m considering for purchase, I came across this site, which purports to have the specifications for all the layers for PLB mattresses. It suggests the layer arrangement is:
[table]
[tr]
[td]Layer Type[/td]
[td]Thickness[/td]
[td]Description[/td]
[/tr]
[tr]
[td]Comfort[/td]
[td]2"[/td]
[td]All Natural Talalay Latex - 19 ILD Medium Plush[/td]
[/tr]
[tr]
[td]Comfort[/td]
[td]2"[/td]
[td]All Natural Talalay Latex - 28 ILD Medium Firm[/td]
[/tr]
[tr]
[td]Support[/td]
[td]6"[/td]
[td]All Natural Talalay Latex - 36 ILD[/td]
[/tr]
[tr]
[td]Cover[/td]
[td]-[/td]
[td]400+ gram washable / removable cover w/ ActiveFusion. Organic Cotton w/ wool fire barrier [/td]
[/tr]
[/table]
The specs for the other PLB mattresses on that web site are close but not identical to those specified in post # 2 here.