Your duvet cover won’t be very comfortable without the All Season Down Alternative Solid Comforter by Superior inside. This comforter is filled with down alternative material and covered with insulated a microfiber-polyester blend. Baffle box construction with double stitching keeps the filling in place. It is hypoallergenic and medium weight for all season warmth. For easy care, toss the comforter in your washing machine whenever it needs freshening up.