Luxury White Goose Down Alternative Comforter, KING Duvet Insert Luxurious goose down-alternative comforter for year round Comforter 102-inch by 92-inch. Box stitched design to avoid any shifting Comforter set fabric content: 100-percent polyester. Washing instructions: machine wash in cold water, tumble dry low 100% Hypoallergenic Poly Fiber Fill Down Alternative. Factory Vacuum Packed.