Hi Quickstrike,
You have every right to know about the specifics of the materials in any mattress you purchase so that you can confirm the quality and durability of the materials and make more meaningful comparisons with other mattresses … especially in the budget range you are looking at.
While some information can legitimately be considered to be proprietary to a manufacturer … there are many manufacturers that claim that the information you would need to make an informed choice is also somehow “proprietary” but I certainly wouldn’t agree. You can read a little more about “so called” proprietary materials and using this as a justification for not disclosing what I would consider to be essential information here and here and here.
NOTE ADDED: I have talked with Chad and have confirmed that none of the materials in any of the Beds by Design mattresses are either synthetic or natural latex and they are versions of polyfoam. Some of the materials are high performance polyfoams that are certainly a good quality material and have many of the properties of latex but are less costly than “real” latex (synthetic or natural).
Phoenix