A down comforter is a type of bedding filled with the soft, fluffy undercoating of ducks or geese, known as down. This natural insulation provides excellent warmth while remaining lightweight, making it a popular choice for many households. Down comforters are often covered with a cotton or polyester shell to protect the filling and enhance comfort. These comforters come in various weights and warmth levels, allowing users to choose one that suits their climate and personal preferences. They are typically machine washable, but care instructions should be followed to maintain their quality. Properly cared for, a down comforter can last for many years.