Isn't this the same type of foam that is used for replacement foam kits for Mustang and other cars interiors? It is injection molded in this case but can be in sheet form. It is smooth on the surface and has great shape retention and seems like its density gets greater the more it is compressed. When you blow steam on it, it gets soft and the shape can be molded to be rounded out or stuffed in corners of pre-stitched upholstery. If this sound anything like it tell me.