Enjoy cosy, practical comfort night after night with this anti-allergy duvet. Made up of a 4.5 tog and a 9 tog duvet, it can be easily separated for the summer when you want lighter weight bedding, or fastened together to create a cosy 13.5 tog duvet - like having three duvets in one. The filling is scientifically proven to help reduce dust mite allergens, making it a great choice for a fresher sleep environment. Part of the Smart Wash & Dry collection (formerly Supremely Washable), it has a quick-dry finish which means it can be washed, dried and back on the bed within a day.