The Fogarty hollowfibre single duo duvet 13.5 tog gives you three duvets in one. The set comprises a 4.5 tog duvet and a 9 tog duvet, which can be joined to give you a 13.5 tog duvet - meaning you have 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.