Bring a sense of the sea side into your home with this beautiful, casual Beach House bedding collection. The shell pattern is printed in shades of blue onto a white, cotton brushed twill. The duvet is fully reversible, reversing to a Yarn-Dyed stripe in blues and white. The duvet is oversized and machine washable for easy care.a duvet cover is a protective cover for your comforter, most likely for your down comforter. Sometimes it's referred to as a comforter cover. Duvet covers are not filled. It has an opening where you can insert your comforter. Filler not included.