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The Science Behind Down Duvets: Understanding Fill Power and Loft

The Science Behind Down Duvets: Understanding Fill Power and Loft

Down duvets have long been favoured for their incredible warmth, comfort, and lightweight properties. If you’ve ever slept under a down duvet, you’ll know just how cozy and luxurious they feel. What exactly makes down duvets so special? In this blog post, we’ll delve into the science behind down duvets, exploring the concepts of fill power and loft, and how these factors contribute to the overall quality and comfort of your bedding.

What is Down?

Down is the soft, fluffy layer of insulating feathers found beneath the outer feathers of waterfowl. It is a natural, renewable, and biodegradable material that has been used for centuries as a source of insulating in bedding. Down’s unique structure, consisting of clusters of filaments radiating from a central point, creates air pockets that trap warm air, providing superior insulation and warmth without adding significant weight.

What is Fill Power: The Measure of Warmth

As we covered Fill Power already, you can dive deeper into understanding of fill power in this blog: Choosing the Right Duvet: A Guide to Fill Power, Fill Weight, and Shell Material. Fill power (also known as loft) is a key term you’ll come across when shopping for down duvets. It is a measure on a scale of 400 to 900. We only produce down-filled duvets between 600 to 900 fill power, which is the perfect desired level of fluffiness, warmth, and lightweight.

Why Fill Power Matter


Higher fill power results in a warmer duvet. The trapped air within the down clusters acts as an insulating barrier, preventing heat from escaping and keeping you warm during cold nights.


DOWN is a natural insulator that also wicks away moisture and allows air to circulate, providing a comfortable sleeping environment. Higher fill power and loft contribute to better breathability, as more air can be trapped and circulated within down clusters.


Down duvets with higher fill power and loft offer superior warmth without adding significant weight. This means you can enjoy a cozy, warm duvet without feeling weighted down or restricted.


As you noticed by now, all of our down are high-quality with higher fill power tends to be more resilient and longer lasting. Just remember that a well-maintained down duvet with high fill power can last for decades, providing you with excellent value for your investment.

In conclusion, when shopping for a down duvet, understanding fill power (loft) is crucial to finding the perfect product to suit your needs. Higher fill power (loft) indicates better insulation, breathability, and overall quality, ensuring a cozy and comfortable sleeping experience. By considering these factors, you can make a sound decision and invest in our down duvet that will keep you warm and comfortable for years to come.

March 23, 2023