Add the finishing touch to your bedroom decor with the Restful Nights Spring Air® Serenity Supreme Duvet Insert by Pacific Coast Feather available in Twin, Full/Queen, and King. A beautiful duvet cover is incomplete without a quality down alternative duvet insert. The Restful Nights Spring Air® Serenity Supreme Duvet Insert is ideal for fluffy medium warmth for year round comfort and provides a high loft down comforter without the hassle of dry cleaning. A Restful Nights Spring Air® Serenity Supreme Duvet Inserts feature a white outer shell crafted of pure 230 thread count 100-percent cotton, and are filled with Ultima fibers for springy and resilient loft. The ring stitch design eliminates fill shift and the duvet insert can be machine washed and dried.