NEMO Muse Duvet 40

Mountains Plus says:
The Muse(TM) Duvet is a 700 fill power down duvet that converts to a rectangular sleeping bag when paired with the Muse(TM) Cover. Fleece-like on one side, smooth and wicking on the other, the Muse(TM) Cover features a perimeter zipper that allows for quick conversion to a sleeping bag. On its own, the Muse(TM) Cover is a great way to breathe new life into a home duvet by transforming it into a camping bag for friends or family.*Cover sold separately