Duvets reduce the complexity of making a bed, as it is a single covering instead of the combination of bed sheets, blankets, and quilts or other bed covers.
There is one thing very particular to them, that they do not cover themselves with bed-clothes.
The duvet cover is removed and laundered as often as the bottom sheet and pillow cases.
A modern duvet, like a sleeping bag, may be filled with down or feathers of various quality and cost, or silk, wool, cotton, or artificial fibers such as polyester batting.
That's all men!