This is an INSERT for duvet.

100% Silk.  Complete in 300TC cotton cover with a little inspection zip, discretely stitched into them, simply so the purchaser may inspect the long white silk fibers.  4 tabs at each corner to secure duvet cover.  Silk comforter is lightweight, but super warm, and also keeps you cool when you get too hot. 

The warmness of the silk duvet depends on how much silk is filled. Our queen silk duvet is 3.3lbs, 4.5lbs for king are good for winter 64F indoor with central heating.

Maintenance: Air dry in shaded area away from direct sunlight for two hours, two to three times a year. Spot clean the cotton cover with cleaning cloth and warm water. Always use the comforter with duvet cover.