Select Foam Grandis-HD Ongoing Review

[phoenix]

Hi grandMasterJ,

The sales personnel informed me that the ILD rating of the Cozypure (with 3" topper) was 65. Two other beds I tried there were 75 and and something in the 80s and too firm for me.

What they are giving you is the density of the Dunlop latex rather than the ILD. You can see the rough translation from density into ILD for 100% natural Dunlop in post #2 here. I would keep in mind as well that this is just the ILD of the top layer and all the layers of a mattress will have an effect on how it feels not just the top layer. ILD is also only one factor that determines the softness of a material so I would also keep in mind that they are not necessarily comparable between different types of latex because Talalay and Dunlop both have a different compression modulus (they get firmer as you compress them more deeply at different rates) so Dunlop will feel firmer than Talalay of the same ILD when it is compressed more than 25% (where most ILD measurements are taken) which is why Dunlop generally will feel firmer than the same ILD and thickness of Talalay.

How well will these soft toppers mesh with the dense memory foam layer on the bed already?

That’s a personal preference. Some people will like the combination and say it blends well and others would say it doesn’t and don’t like it as much. It will also depend on the type of memory foam and how sensitive it is to heat because a layer on top of memory foam will reduce the amount of heat that reaches the memory foam underneath it which will slow down how quickly it warms up and affect its firmness and response. Thicker layers on top of memory foam will reduce the amount of heat that reaches the memory foam more than thinner layers so the thickness of each layer will also make a difference in how the combination feels and some people may like one latex / memory foam combination (with different types and thicknesses of each material) more than another. In my own case I like the feeling of a more resilient sleeping surface that comes from the latex with the slower somewhat “delayed reaction” sinking in from the memory foam underneath it.

I’m thinking of clothing this bed in linen sheets. I know mattresses are the focus here, but I’d be interested if anyone had any opinions on that. Supposedly last generations (archaeologists have found linen 4000 years old), softer the more you wash them, “sleeps cool,” and were commonly the “luxury of royalty bedding.”

Linen sheets are among the coolest sleeping sheets and are also very durable. As you mentioned they also get softer with use. You can read more about different types of sheets in post #7 here and the other posts it links to and the last two links in the post lead to threads which talk more about silk and linen sheets.

Phoenix