The softest and most luxurious of all fills, natural duck down has a unique effect that traps and holds air, making for a very plush feel. The result is the perfect loft and cushion to nestle your head. The medium-density pillow gets its fluff from pure down encased in a soft, 230-thread count cambric cotton shell. Double-needle stitching and cotton cording ensure many a good night's sleep as this premium pillow contours around your head and neck.