Rockcloud offers you a summer or winter weight, in single, double or king sizes. Our summer weight is ideal for most British summer nights at approx. 5 togs. Our summer duvets are filled with the finest grade A long mulberry silk and the silk weight is 1 Kgs in the single size, 1.5 Kgs in the double size and 2 Kgs in the King size. Our winter weight at approx. 10 togs is perfect for winter nights in a centrally heated house, and if you buy only one this would be our choice for all year use. Our winter duvets are filled with the finest grade A long mulberry silk and the silk weight is 1.5 Kgs in the single size, 2 Kgs in the double size and 3 Kgs in the King size. We have provided poppers to enable the summer and winter weight to be fastened together if required. We recommend this if you regularly sleep in temperatures below 10°C. (We offer a discount if you buy the two together - see combination costs.) (the cost includes VAT at 17.5%, packaging, courier and insurance) All sizes are approximate Single 135cm x 200cm 4'6" x 6'6" Double 200cm x 200cm 6'6" x 6'6" King 240cm x 220cm 8' x 7'2" Summer 75.00 0.00 0.00 Winter 0.00 105.00 0.00 Combination (Summer & Winter) 0.00 0.00 0.00 Please email: sales@rockcloud.com for further details or queries. We suggest that you read the care instructions before making your purchase.