Nimbus Emporium Duck Feather and Down DOUBLE Duvet 4.5 Tog Nimbus New White Duck Feather and Down 4.5 tog Duvets are only filled with soft, luxurious New White duck feather and down, you will enjoy far greater longevity from this duvet than those produced with man-made fibres. It’s pure 100% cotton percale, high 240-thread count casing will allow your skin to breathe naturally, ensuring a luxurious & comfortable night’s sleep!! The combination of small fluffy feathers and light down clusters is the perfect duo for a comfortable night's sleep. 10 Year Manufactures Guarantee. Material: 15% White duck down, 85% White duck feather, 100% cotton casing. RRP from Ocado = £57 and Linenfields = £