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The expression ‘fill power’ is being used more frequently by our customers when they are considering the purchase of a natural duvet. This is an American term and shows the power of the internet. Research natural duvets online and most American sites will talk about fill power, but what does it mean?

Fill power is a measurement of the amount of space that one ounce of down will occupy in cubic inches when allowed to reach its maximum loft. It is calculated by placing one once of down in a Plexiglas cylinder and then compressing it. For those with a technical mind, the calculations can be found on Wikipedia.

die-zudecke-canadian-snow-goose-down-duvetThe higher the fill power the more air an ounce of the down can trap. So it follows that the higher the fill power, the larger the clusters of down.  The larger the down cluster the higher the quality which is why the Die Zudecke Canadian White Snow Goose Down duvets and pillows are so good.

Generally the largest clusters of down come from mature birds. The larger clusters trap more air, produce a higher loft and have better insulating properties.

In the UK we still use the TOG system and the weight of the filling in grams per square metre. For more information read our blog Ever Wondered What a TOG value is.

Die Zudecke who manufacture our Canadian White Snow Goose Down in Germany do not quote fill power as they believe it is not an exact science and doesn’t necessarily reflect the warmth rating of a duvet.

To summarise, the better the quality of down, the higher the fill power. Therefore it follows that the Canadian White Snow Goose Down, the Die Zudecke Hungarian White Goose Down and the Nimbus Premium New White Goose Down duvets and pillows will have a high fill power.

We hope this helps explain the world of fill power