Down Comforter Cover To get the most of your down comforter, we always recommend using a cover it's much easier to wash and is a great way to update the look of your bedroom. From modern and unique designs from Dwell, to the classic and timeless styles of Peacock Alley and Frette, all of our duvet covers are made from machine washable 100% long-staple cotton and most styles also have matching pillow shams and bedskirts available.