Choose a flannel duvet cover from the Beddinghouse brand to keep you warm this winter. All Beddinghouse flannel is made of 100% cotton. Cotton is a natural and breathable product that absorbs moisture well. With flannel, the fabric is roughened on both sides, making it woollier and thicker than regular cotton. This makes these duvet covers feel very warm and soft, in short, perfect for cold winter nights. These flannel duvet covers ensure that you can turn the heating down a degree this winter and are also extra affordable.