Hi eeks,
I don’t keep a record of the specifics of every mattress that each of them offer (it would be more than anyone could keep up with in a constantly changing market) so it would be best to check their websites or talk with them and ask but off the top of my head I know that SleepEZ and Arizona Premium (mattresses.net) and Cozy Pure all make all latex mattresses that don’t contain any wool in their covers. Some of the others may also have cover options that aren’t specifically mentioned on their websites as well that they will let you know about when you talk with them on the phone.
Plushbeds and Foam Order and Pure Rest are a few others off the top of my head that also make some all latex mattresses that have cover options that don’t contain any wool although there would be others as well that don’t spring immediately to mind.
Some of the sources for individual stretch knit covers that are listed in the component list I linked in my last reply also sell individual latex layers as well that you can use to make your own DIY mattress although they are only sold as individual mattress components and can’t be sold or described as an actual finished mattress because their cover/latex combinations haven’t passed the fire regulations.
Some of the comments I have read from online bloggers about the Intellibed are somewhat “suspect” as well and they don’t appear to have a great deal of knowledge about mattresses and mattress materials.
Buckling column gel itself is certainly a somewhat unique material and is also very durable. It’s one of those materials (much like memory foam) that tend to generate strong feelings either for or against it depending on preferences but for those who like how it feels and performs it can certainly make a good choice. You can see some of my comments about the Intellibed (and other types of buckling column gel) in this topic and in this topic a forum search on Intelligel or on Intellibed (you can just click the links) will bring up more comments and feedback about them as well. A forum search on buckling column gel (you can just click this as well) will also bring up more comments and feedback about other types of buckling column gel as well.
Buckling column gel is certainly not a “natural” material although there are many synthetic materials that for most people would certainly be “safe enough”.
While it may be more information than you are looking for … there is a lot more information in post #2 here and the more detailed posts and information it links to about safe, natural, organic, “chemical free”, and “green” mattresses and mattress materials that can help sort through some of the marketing information and terminology that you will encounter in the industry and can help you differentiate between them and answer “how safe is safe enough for me” that can help each person decide on the types of materials they are most comfortable having in their mattress or on the certifications that may be important to them. These types of issues are complex and are generally specific to each person and their individual sensitivities, circumstances, criteria, beliefs, and lifestyle choices.
Phoenix