The House of Emily HUNGARIAN GOOSE DOWN Comforter - 54" x 78", 650 Fill Power, All Seasons 13.5 Tog, 100% Cotton Cover 100% Cotton Combined All Season Duvet. 4.5 Tog + 9 Tog = 13.5 Tog. Size of each duvet 137cm x 200cm - 54" x 78". The 4.5 tog duvet can be used in the Summer and the 9 tog in the Spring & Autumn. Attach them together for a 13.5 tog for the Winter. Duvets are attached through buttons. 100% Down / No Feathers have been added. Hungarian Goose Down is known throughout the world as the finest filling for duvets and pillows. 650 Fill Power. What is Fill Power? Fill Power is the main factor when determining the quality of any down filled product. The higher the fill power is, the larger and stronger the goose down clusters are. With high fill power goose down, you need less weight of goose down to keep your body insulated. The high fill power is reflected in the filling weights which are: 4.5 Tog - 320 grams, 9.0 Tog - 580 grams. 233 Thread Count 100% Cotton Cambric Down Proof Cover with White Cotton Piping and Double Stitched. Duvets are made with a cassette construction which means that the casing is divided up into pockets into which the filling is placed. As a result the filling does not move around ensuring an even spread of insulation and no cold patches. NOMITE' - which confirms that the duvets are suitable for house dust mite allergy sufferers.OEKO-TEX Standard 100 - see www.oeko-tex.com for further details. The latest German and Swiss detergents are used to clean the filling. It is completely cleaned during the washing and rinsing phase and then dried at 120C for 30 minutes. By this method the filling becomes completely antibacterial.