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Loft refers to the amount of space an ounce of goose down fills. One ounce of Hutterite goose down fills 800 cubic inches. Many goose downs on the market fill 550 to 700 cubic inches. Very few down comforters are in the 800 range. Down comforters with high loft are very warm, even though the amount of goose down used is less than the amount other down comforters use. The higher the filling power, the greater the insulating power.