I will never ever (!!) understand the habit of having one duvet for a double bed! If you use the room alone it is heavy and to much fabric. If you are with someone you are constantly battling over the possession of the sheets! Or, if you are traveling with a good friend, who is just that, a good friend, you might be comfortable enough to be in the same bed, but not under the same duvet! No, there is no use in that single cover.
