What Is Down Fill Power (2025): Fill Weight, Synthetics

When shopping is the word “Down Fill Power” you are moving across? Sleeping bagPuffer jacket, or A duet? These numbers are 450 to 900 and sometimes above. Usually-not always that number is higher, the better the weight from the warmth. But what does the filling power really measure?

To measure the filled energy, the companies test a lab to measure the down flafness. The technical test is how much inch mounts come from one ounce down. A container is filled with one ounce down insulation, then a weight is placed on the top. One minute after the weight is compressed, the down volume below the weight is measured. The important thing to remember is that Fill Power is a measure of down quality, not quantity. Higher Fill Power means larger down cluster and greater down clusters are fluffed up more than the smaller down clusters. The graphic below depicts the difference in the mount in various filled energy.

Down and Courtesy of Feder Company

The outdoor gear is usually from 500 fil power to lower end of high-end ultraite jacket and sleeping bags, from 900-filled power to cold-welcome backcontri adventure. Highness (that is, the higher fill power) means that the Park or Sleeping bag will compress much smaller, which will make them more packaged for travel or backpacking.

What is the Down Fill Power tells you?

The higher the full energy, the higher the macha. Down puffer jackets and sleeping bags are kept warm from your body, holding it in the air pocket in the bottom. Powering a higher down fill means that the downty has more macha which means more air pocket which means that more heat is kept. If everything else is equal, it means that the higher fil power garment will be warm with low -fill power.

Unfortunately, everything else is never equal. Not enough information to meet solo energy is not enough information to know what will be warm. There is no direct correspondence between Fill Power and how a product will keep you warm, because this filling should be considered as many more factors like how much it is in the product and how well it can expand in the jacket cut or design.

You need to know at least another number of down jackets, sleeping bags or how warm will you know: full of weight.

What is the weight of the filled?

Photograph: Tatiana/Getty Fig

A common number of weight -filled weight. This is down to the product down, usually measured in ounce or in the village. Using down filling weight and down fill power together can give you a way to compare two items. For example, the relative warmth of a puffer jacket can be estimated by multiplying the energy filled with weight filling. This means that a 900 Fill Power Jacket with 2 ounces fill weight will be equal to 600 filling power jackets with a 5 ounce fill weight. The big differences between them and the factors are priced separately that is the weight of each and the packed size.