Down vs. feather. The differences are explained here...
APILLOWISFILLEDWITHLARGEORCHOPPEDFEATHERSBECOMESFLATANDCOMPRESSEDQUICKLY.DOWNPILLOWSARESOFTERANDLASTMUCHLONGER.,Downprovidesminimalheadandnecksupportinpillows.Pillowscontainingfeatherprovidemoreresilientsupportandfirmnessduetothespringyfeatherqui...。參考影片的文章的如下: