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With custom mattress sizes depths vary widely among manufacturers. It's important to measure the depth of your mattress before purchasing a goose down comforter. Standard and older mattresses average 9 inches to 12 inches deep, while newer, pillow-top mattresses are 14 inches to 16 inches deep or even deeper.
Deeper mattresses require additional comforter depth so that the very fluffy down comforters cover the mattresses completely. Luxury goose down comforters puff out for much less coverage. Down comforters in the exact measurement you need to cover your bed can be found online.