Feather quilts, also known as eiderdowns, are a type of bedding made from down feathers. They are usually filled with the softest and lightest feathers from ducks or geese, which provide a luxurious and comfortable sleeping experience. The feathers are stitched together in a quilted pattern to create a warm and cozy blanket. Feather quilts are popular for their warmth and comfort, and they can be used in any season.