According to this article it is possible to purchase a duvet that is thicker on one side than on the other. It is aimed at couples where one partner feels the cold more than the other. The TwoTog duvet is filled with Hungarian goose down and is available as a summer and winter version. The summer version has two sides, one with a tog rating of 4.5 and another with a tog rather of 7. Despite the difference in thickness the duvet looks no different to any other once it is on the bed. The winter version is made up of two halves with a 10.5 tog rating and a 13.5 tog rating. If you want one prices start at £140.
