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Educate Yourself About Down




International Down and Feather Laboratory, or IDFL, is one of the world's foremost authorities on testing down and other filled textile insulations. The outdoor industry throws around terms like loft, fill power, down percentage, and DWR, but what do those terms tell us? Educate yourself before purchasing so that you know what you are getting.

Two glass jars laying horizontally in a shake tester to determine how much loft is preserved when wet
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Why Water Resistant Down?

A lot of companies claim their down is waterproof…but how waterproof is it? Matt Lieber from IDFL pulls back the curtain on the Hydrophobic Shake Test, showing a real 90-minute test pitting KUIU’s Quix Down against a competitor.

Close up view of individual down plumes scattered on blue work surface
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What's In Your Down?

IDFL’s Matt Lieber explains how a Composition and Species Analysis works, showing a real-world analysis of KUIU’s Quix Down. Matt lays out why you care whether your jacket is made of goose or duck down, and why the down cluster percentage tells you about the quality and cleanliness of your jacket’s down fill.

Two glass vials containing different types of goose down in preparation for a shake test
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Why Does Fill Power Matter?

What is fill power, and why does it matter? IDFL’s Matt Lieber reveals how a Fill Power test works with real-world tests of KUIU’s Quixdown versus a competitor, and explains why higher fill power is better for high performance and reduced weight.

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