Duvet vs. Comforter
A duvet is not supposed to be washed in a regular basis; it requires a matching duvet cover but it reduces laundry costs, drying times and energy consumption.
A comforter or blanket is made of a more durable, fashionable outer fabric than a duvet insert. Both are filled with down or synthetic fibers. Comforters do not require covers and can easily be washed on their own.