Siberian Down Single Duvet Down clusters come from the breast of the bird and have excellent insulation properties. They are lightweight, yet have a unique ability to trap warm air which makes them excellent at regulating body temperature and keeping you comfortable at night. This luxurious duvet has a 360 thread count down proof cotton casing and an internal cassette pocket construction which helps to keep the filling evenly distributed throughout, to aid your nights sleep Professional laundering in a large capacity machine is recommended Do not dry clean Do not bleach Tumble dry with care Do not iron Air outside in good weather