The primary component intended for enclosure within a duvet cover is a duvet, also known as a comforter or quilt. This insert provides the insulation and warmth for bedding. As an example, a down-filled or synthetic-filled comforter is commonly placed inside the cover for protection and ease of cleaning.
Utilizing a duvet cover significantly extends the lifespan of the enclosed comforter by shielding it from dirt, stains, and wear. It also offers a convenient method to alter the aesthetic of a bedroom without requiring the purchase of a completely new comforter set. Historically, these covers have been employed for practical reasons of hygiene and ease of laundering in various cultures.