Down is defined as a unique three-dimensional cluster with the ability to trap air and add warmth without weight. It’s breathable and wicks away moisture while insulating. All of the down and feathers used are sent through a proprietary cleaning and sterilization process, making the down hypoallergenic. The shell is made of a 100% cotton, down-proof fabric in a baffle box construction, keeping the fill evenly distributed. The warmth level of this duvet insert is lightweight, ideal for warmer nights or climates. This option fits standard King-sized duvet covers. Also available in Queen and Twin sizes.