The Malouf Z Triple Layer Down pillow is constructed of down, feather, and natural cotton. This pillow is made up of three separate internal layers. The top and bottom layers are made of 90% down and 10% feathers (duck down and duck feathers). The middle layer is the opposite, 10% down and 90% feathers. The cover is made of 100% unbleached cotton and the cover isn’t removable. Additionally, the pillow comes in a reusable carrying pouch so you can easily transport your pillow if you want to take it with you on vacation or a business trip. This pillow is great for side and back sleepers.