Goose Down Comforter White goose down, especially of the Polish or Hungarian variety, is considered the finest filling for a down comforter. All of our comforters (also known as duvets), except the Celestial classic which is duck down, are made with white goose down of high fill power. Our Mirage duvet, for example, is filled with Polish goose down of 700+ fill power (the higher the fill power, the better) and encased in 354 thread count sateen ticking. Many of our duvets also come in queen and king oversizes.