Comforter Down Down comforters, often called duvets, come in a variety of weights and fills. Our down comforters are filled with premium quality downs, like Hungarian or Polish goose down (not feather blends), with fill powers of 575 and higher. Our comforters are encased in high thread count, down-proof 100% cotton for superior down distribution. Most are constructed with baffles - the best way to keep the down from shifting without creating cold spots. For more information about down, down fill power etc, visit our down information page. The Allusion duvet is a synthetic alternative to down that looks and feels similar to the real thing. We recommend using a duvet cover at all times, since they are much easier to wash than the duvet itself.