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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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Explore some of the products featured in the article.

SHOP THE GEAR

Explore some of the products featured in the article.

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1. Super Down LT Jacket

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Front of Super Down LT Jacket in Valo Camouflage

2. Super Down LT Hooded Jacket

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Front of Super Down LT Hooded Jacket in Verde Camouflage

3. Super Down LT Pant

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Front of Super Down LT Pant in Gunmetal

4. Womens Super Down LT Jacket

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Front of Women's Super Down LT in Verde Camouflage
Close up of thousands of down clusters scattered across a blue work surface
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The Feather Scientists

The International Down and Feather Laboratory is the foremost authority on testing down. Watch their procedures that certify KUIU’s QuixDown.

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.

Down technician preparing large cluster of Quixdown for final inspection
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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.

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