What's the difference between a down comforter and a 'goose feather down fiber' comforter?

Most affordable 'down' comforters, including several here, are actually goose feather and down fiber blends rather than pure down. Specialist bedding community threads we read repeatedly stress that pure down feels noticeably loftier and lighter than feather-fiber blends, while feather blends are cheaper, sometimes noisier, and can feel less plush. If you want true cloud-like loft, look for high fill-power pure down; if you want a budget all-season insert, the blends are a reasonable compromise.