Down Comforter A down comforter is essentially the same thing as a duvet. While many poly-fiber filled comforters are designed for use without a cover, we strongly recommend using a cover on all down filled comforters. Our down comforters are filled with premium goose down of fill-powers no less than 575, and encased in 100% cotton ticking no less than 230 thread count. We carry a range of weights and sizes, so you'll find just the right down comforter for your bedroom and climate.