Duck vs. Goose Down: Which Filling Is Better?

Duck or goose down – anyone shopping for a new duvet or down pillow runs into this question almost immediately. Both fillings are made of the same three-dimensional down clusters, but they differ in size, fill power, and price. Goose down is traditionally seen as the higher-quality option because its clusters are larger and trap more air, giving more warmth for less weight. Duck down is more affordable and provides plenty of warmth for most sleepers. This guide explains what the difference actually comes down to, what the down-to-feather ratio on the label means, and which filling suits your sleep needs.

What Actually Sets Duck and Goose Down Apart

Down isn't feathers in the traditional sense. It consists of small, three-dimensional clusters with no stiff quill, which form beneath the outer feathers of waterfowl and trap air. It's this trapped air that provides warmth, not the weight of the filling. Because geese are considerably larger than ducks, they also produce larger down clusters – and larger clusters trap more air than smaller ones. That's the core difference between the two filling types; everything else follows from it.

Both types of down are a byproduct of poultry farming. Shoppers who care about sourcing and animal welfare can look for certifications such as the Responsible Down Standard (RDS), which sets requirements around rearing and traceability. This certification applies regardless of whether the down comes from ducks or geese.

Fill Power and Warmth Compared

Fill power describes the volume a given amount of down occupies, usually measured in cubic inches (cuin) per ounce. The higher the value, the more air fits between the clusters, and the warmer the filling is relative to its weight. Duvets on the market typically range from about 300 to 750 cuin. Goose down tends to reach higher fill power values on average than duck down and often falls in the upper part of that range.

This doesn't automatically mean a goose down duvet is warmer than any given duck down duvet. A thicker duck down duvet with more fill weight can easily outperform a thin goose down duvet in raw warmth. What matters is always the interplay between fill power and fill weight per square meter, not the bird species alone.

The Down-to-Feather Ratio: What the Label Reveals

Pure down fillings with absolutely no feather content don't really exist – processing always leaves a few feathers behind. That's why the care label shows a ratio such as 90/10 or 80/20, indicating the proportion of down to feathers, determined according to the European testing standard EN 12934. A higher down content means more loft, less weight, and generally a higher price, since separating down from feathers is a labor-intensive process.

Reading Warmth Classes Correctly

Summer, all-season, and winter duvets differ mainly in fill weight, not necessarily in the type of down used. A lightweight summer duvet can be filled with goose down and still be cooler than a heavily filled winter duvet made with duck down. When buying, it's worth checking both figures – fill weight in grams per square meter and the down-to-feather ratio – rather than relying on the bird species alone.

Care and Longevity

Down duvets and pillows should be aired out and shaken regularly so the clusters can regain their shape and moisture can escape. Prolonged compression, such as storage in a vacuum bag, permanently flattens the clusters and reduces fill power. The care instructions on the label – wash temperature, drying, professional cleaning – apply regardless of whether duck or goose down was used, since both are made of the same fiber type.

With proper care, a high-quality down filling stays lofty for many years. Goose down is considered somewhat more resilient to repeated washing thanks to its sturdier clusters, though the difference only becomes noticeable after many wash cycles.

Which Filling Suits Which Sleeper?

If you want the lightest, warmest duvet possible and are willing to pay more for it, goose down is the classic choice. If you're after good value for money and don't mind a bit more fill weight, duck down usually serves just as well. Anyone with a known feather allergy should, regardless of bird species, opt for specially treated allergy-friendly down or synthetic fillings, and check with their allergist before buying.

Why Maison de Cocon

• Our duvet range includes the Tencel™ Four Seasons Duvet – a lighter summer duvet and a spring/autumn duvet that tie together for winter – and the Tencel™ High Summer Duvet (140 g/m²), our lightest option.
• We're happy to explain warmth classes and fill weight if you're unsure whether to choose a summer, all-season, or winter duvet.
• Questions about caring for and cleaning your duvet are answered directly by us, with no detour through a call centre.

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