The Peacock Alley down alternative pillows are perfect for those who want the cushiony comfort of down but prefer to keep their beds allergy-free. Sleeping pillows are available in medium or firm in two sizes. Each pillow comes with a removable 400 thread count cotton sateen pillow protector for washing. To complete the line-up, try the sumptuously sized Euro at 28in square. Dacron is a brand of polyester used as down alternative fiberfill; fibers can be luxuriously fine and lofty like down itself, or firm and supportive for use in mattresses and mattress pads.