Hi lesibly,
Post #6 here has the specs I was given by a local retailer that carries them.
They are 100% natural Talalay and you can see the ILD range for the N1 to N5 firmness ratings that Latex International uses here. The 25 ILD is apparently an N3 but it’s right at the bottom end of the range so I don’t know how accurate that is. Apparently they also have the option for an N2 but it’s not convoluted. The 35 ILD is also at the top of the N4 firmness rating or the bottom of the N5 so I’m not sure which one it is (I would guess N4). A convoluted topper would also have an effective ILD that is lower than its ILD rating because of the convoluting.
I don’t know how much wool is in the cover (it seemed like a fair bit to me) which would also have an effect on how it feels and the cover is a thick stretch cotton.
That’s as much as I know.
Phoenix