Hi Warder45,
HeaveaPUR is just a trade name that they use for latex. In their iChoice HeveaPUR mattresses the HeveaPUR latex is Talalay. They say it’s 100% natural in the description but I would confirm this because their ILD numbers match the numbers for Talalay Global’s blended Talalay latex.
ADMIN NOTE:Removed 404 page link | Archived Footprint: latexfoam.com/products.html
In their HeaveaPUR mattresses they say that the latex has an organic certification which would mean that it’s Dunlop because there isn’t any certified organic Talalay latex.
The thickness of a layer and the firmness of a layer will both affect how soft they feel so it’s quite common for softer latex mattresses to have thicker comfort layers and be thicker overall than firmer latex mattresses.
All foam materials will soften over time but latex in general is the most durable of all the foam materials so it will soften less and more gradually than other types of foam materials.
The softness of a foam material will also affect its durability because softer layers are less durable than firmer layers that use the same type of material and foam materials will also soften and break down faster for those that are in higher weight ranges than for those that are in lower weight ranges so I would be cautious with mattresses that use softer latex layers (particularly with an ILD in the low to mid teens) because they are more likely to soften or break down more rapidly with your weight and there would also be a higher risk of alignment issues when you sleep on the mattress as well.
There will be a break in and adjustment period for any new mattress or sleeping system as the mattress loses any of it’s “false firmness” and the cover stretches and loosens a little and the materials settle and your body gets used to a sleeping surface that is different from what it is used to (see post #3 here) but the mattresses on the showroom floor will generally already be broken in so you wouldn’t need to take this into account.
For most people there will be a range of firmness levels that will be suitable for them to sleep on but for some people that are less sensitive the range would be wider and for some people that are more sensitive the range would be narrower. I would choose the mattress that your careful testing for alignment and pressure relief indicates is the best match for you in terms of comfort, firmness, and PPP (Posture and alignment, Pressure relief, and your own Personal preferences) but if you find that there are two mattresses that would both be suitable choices then I would choose the one that is slightly firmer.
Phoenix
PS: I called one of their stores after I wrote my original reply to ask them about the latex in the HeveaPUR mattresses and they told me that it was Talalay that comes from Sri Lanka but the descriptions say that the latex has a GOLS certification and there isn’t any Talalay latex that has an organic certification and there also isn’t any Talalay latex that is made in Sri Lanka and when I told him this he said he would check further and email me what he was able to find out. If it really is Talalay then the description that says it has an organic certification would be incorrect.