The Fogarty hollowfibre king-size duo duvet 13.5 tog is three duvets in one. The set comprises a 4.5 tog duvet and a 9 tog duvet, which can be joined to make a 13.5 tog duvet - giving a duvet for every season! The Fogarty duo duvet has a polyester and cotton cover with a 100% hollowfibre filling. It is machine washable and suitable to tumble dry.