Down filling: Fill power, goose down and feathers

Sleeping under a soft goose down duvet has become an increasingly popular choice in recent years. The reasons for this preference are many. Besides the convenience of making the bed quickly in the morning, down duvets offer advantages in terms of hygiene and allergies compared to traditional wool blankets. Moreover, there is a wide range of options to choose from in terms of warmth and weight, thanks to the fill power and the filling. To make the right choice, it is essential to understand the technical features of these products.

Down or feather? How to choose the filling for a double duvet

Goose down bed duvets are primarily distinguished by the type and quality of the feathers used as filling. Excluding synthetic alternatives entirely, there are two main types of filling: down and feather.

Down looks like a soft fluff and is mainly defined by its origin. Down represents the finest filling for duvets.

On the other hand, the feather is stiffer and has a central part called the quill, from which the feather filaments extend. Although it offers good thermal insulation, it is inferior in this regard compared to down.

Goose down: The fill power

Besides the quality of the feathers, another crucial parameter in choosing a duvet is the fill power. You may have noticed that a double duvet can be lighter yet warmer than a single one.

Fill power measures the filling capacity of the down and is the ratio between the volume of the filling and its weight. This value represents not only warmth but also the quality of the product. Duvets with a fill power above 650, indicating a high volume-to-weight ratio, are considered high quality.

A high volume and low weight indicate that the duvet is filled with high-quality down. This allows for greater volume without significantly increasing the overall weight of the duvet.

800 fill power: is it good quality?

Fill power is measured in CUIN (Cubic Inch) per ounce, which represents the ratio between volume in cubic inches and weight in ounces. This value can range from 400 to 850. A duvet with a fill power of 500 is considered medium quality, with low-quality feathers.

For a very good quality duvet, you should opt for a fill power above 600. If you seek the highest level, aim for models with fill power between 650 and 850. Therefore, a goose down duvet with 800 fill power is certainly of excellent quality.

Filling and fill power of the duvet

It is important to distinguish between the type of filling and the fill power when evaluating double or single duvets. These two parameters are connected but represent different features.

A concrete example is given by winter duvets and those for the mid-season, which can have high-quality fillings and excellent fill power but offer different levels of warmth depending on the weight used. This means it is possible to find duvets suitable for different seasons of the year.

Difference between natural filling and synthetic filling

It is also important to mention the difference between natural filling, such as goose down, and synthetic filling. Synthetic duvets can be made with materials like microfiber or polyester. Among synthetic fibers, there are silicone ones that insulate well from the cold but may not be highly breathable. Microfiber is warmer and more comfortable compared to other synthetic materials but rarely reaches the standards of lightness, thermal insulation, and temperature regulation of down duvets. Their average lifespan is also shorter, about 5 years.

In conclusion, the choice between natural and synthetic filling should be made based on your personal needs. However, it is important to pay attention to the quality of the materials to ensure comfortable and healthy nights of sleep. For more information on the different types of duvets, you can consult the articles on our site to understand how to choose a duvet and pair it with high-quality bed linen.