Do you know if it is possible to get replacement back cushion cores for the City sofa that do not contain any down? My doctor would like me to eliminate any feather products due to my lung condition. The pillow and blanket on the bed are easy, the sofa not so much. Do they make them for the back in anything other than down? I don't worry so much about the seat cushions which only have a little and it seems more contained, but the back cores when fuffed do release feathers. I guess I would have to pay the full cost since they are not the same cores that came with the sofa, and I have no idea how expensive that would be. I could actually use a new core for the back where I sit all the time anyway, since I can no longer fluff it back fully into shape.