Our Silk Duvets (comforter/doona) are filled with 100% natural premium grade long strand Mulberry silk fibre and cased with a high quality 320TC Egyptian cotton cover. Luxurious, lightweight, and supple, they envelope the contours of your body like a second skin – no airy cold spots here. Silk is vastly superior to other materials commonly used in duvets like polyester, wool, or down.