Lousy research went into this article. HOW PRIMALOFT IS MADE... To get there, PrimaLoft blends 70 percent premium quality goose down with a 30 percent mixture of its PrimaLoft ultra-fine fibers (the silver version is a more cost-effective 60 percent duck down with 40 percent PrimaLoft fibers). The synthetic insulation uses a small diameter, ultra-fine polyester fiber finished with a proprietary treatment that “makes the product warmer, softer, drier, more breathable and compressible than any other insulation currently on the market,