Hi Tennisman,
Select Foam doesn’t make their own memory foam (and neither do the vast majority of mattress manufacturers including most of the major manufacturers with only a very few exceptions). They do however use a foam supplier that makes some very high quality and high performance foam and has some of the best “foamers” and chemists in the industry IMO.
It’s questionable whether soy foam is a “greener” product than foam that uses petrochemicals as the main feedstock although as with all things connected with mattresses … marketing information tends to rule the day.
It’s true that soy is a more renewable feedstock source than petroleum but the foams that use it only replace a small part of one of the chemicals used to make foam (the polyols) with a chemical that is synthesized from soy oil and whether it is any greener depends entirely on how you define green. At best it’s probably a small step in a good direction even though GMO soy production has many “green” issues connected with it’s production as well including it’s direct or indirect effect on the destruction of the Brazilian rainforest. You can read more about soy foam (and other plant oil based polyols) in post #2 here and there is a great deal more information (perhaps more than you want to know :)) in post #2 here and the links it contains about the controversy that is connected to “green, safe, natural, and organic” issues that are connected but very different from each other as well.
Hope this helps.
Phoenix