I purchased this overpriced sack not knowing that it is made by some company called Peacock Alley. Not the Down Feather Company. I repackaged it immediately when I discovered it is just a sack. No internal buttons or strings to secure it to the duvet. When I complained, the Down and Feather person said I should sew in the buttons myself. Their policy is to NOT accept returns for this item. What a rip off!