Hi mister,
You can see on the CertiPur list* here that there are also mattress manufacturers that are CertiPur certified (meaning they use foam that is CertiPur certified) but this has a substantial cost involved and some manufacturers choose not to add themselves to the list because if they are using CertiPur foams then the benefits of actual certification on a mattress manufacturer level may not be worth the cost to them.
ADMIN NOTE: *Removed 404 link|Archived Footprint: certipur.us/pages/for-consumers/find-products/
You are exactly correct. Thermal conductive gels (like a marble countertop) has a cool feel to it but the cooling benefits end once temperatures have equalized and from that point onwards the foam is insulating. In other words they are a piece of the puzzle and one of the three technologies that are used to cool a mattress which were listed at the end of post #4 here. The words “temperature regulation” and “sleeping cool” and many others are more loose marketing terms in today’s environment where every manufacturer tends to talk about how their mattress are cool sleeping without providing the why behind the what. You can also read about some of the ways that manufacturers (and foam pourers) use to cool down memory foam (because memory foam as a category tends to sleep warmer than other foam types) in post #6 here and post #2 here talks about all the many factors that are involved in the sleeping temperature of a mattress.
Outlast uses phase change materials in the fabric itself and is just “one more piece” of the puzzle.
Hope this helps solve the “sleeping temperature” puzzle and sort out some of the marketing exaggerations from the facts behind them.
Phoenix