Hi Greenmama,
I called them today and while Tim was away until next week … I did confirm that their wool uses a small amount of polyester in their blend (about 12%). While polyester certainly isn’t a natural fiber … there is no specific definition of what “green” really means (it has a different meaning from “natural”) and in most cases in the industry it’s used more as a marketing term than a descriptive term. “Green” also isn’t a black and white definition (where a mattress is either green or it isn’t green with nothing in between) and can only be assessed as part of a range so “how green is green” really depends on all the specifics of a mattress and how the mattress and all the components and materials inside it are manufactured rather than on one specific component. There is more information about “green” mattresses and mattress materials in post #4 here.
While polyester would be toxic if you were to consume it … I wouldn’t have any issues with a quilting material that contained a small (or even larger) amount of polyester fiber being toxic to sleep on although I certainly understand that there are some people that wish to avoid it for more personal, environmental, or lifestyle reasons.
Phoenix