Hi AustinOski,
I fixed the quote tags in your post.
I would guess that they are confusing "100% Talalay (which means that the mattress contains all Talalay latex) with 100% natural (which means that there is no synthetic rubber used to manufacture the latex in the mattress). There are many retailers in the industry that are confused about the difference between them and advertise their blended Talalay as being 100% natural when it isn’t. Talalay Global (previously Latex International) also calls their blended Talalay “natural” and their 100% natural Talalay “all natural” which adds to the confusion. As you can see on latexfoam.com/products.html this page … the ILD numbers they listed are used for blended Talalay.
That’s probably a good idea because they also sell mattresses that are probably used and/or returned (see here). I would make sure that any mattress you are considering there has a factory warranty rather than just a store guarantee.
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The 4" layer could either be a single layer or two 2" layers so the only way to know for certain would be by getting accurate inforamtion from the manufacturer or retailer or looking at the layer itself.
If you are considering a DIY design then you would be able to purchase any layer thickness (up to 6" which is the thickness of the mold) in any ILD from the sources on the component list.
Phoenix