What Is Down Fill Power (2026): Fill Weight, Synthetics Leave a comment

Up to date February 2026: We have added a brand new part on caring for down and a few notes on Outside Very important’s Zero Sew cloth.

What Does Down Fill Energy Inform You?

The upper the fill energy, the better the loft. Down puffer jackets and sleeping baggage hold you heat by trapping the heat coming off your physique, retaining it in air pockets between the down. A better down fill energy means the down has extra loft, which suggests there are extra air pockets, which signifies that extra warmth is retained. If every thing else is equal, that signifies that the next fill energy garment might be hotter than one with a decrease fill energy.

Sadly, every thing else is rarely equal. Fill energy alone just isn’t sufficient info to understand how heat one thing might be. There isn’t any direct correspondence between fill energy and the way heat a product will hold you, as a result of there are lots of different elements to think about, like how a lot of that fill is within the product, how nicely it could develop throughout the baffles or down chambers, how nicely does the material cease the wind, and so forth.

To understand how heat a down jacket, sleeping bag, or comforter might be, it’s good to know at the very least one different quantity: the fill weight.

What Is Down Fill Weight?

Down fill weight is a straightforward quantity. It’s the quantity of down within the product, often measured in ounces or grams. Utilizing down fill weight and down fill energy collectively can provide you strategy to evaluate two objects. For instance, the relative capacity of a puffer jacket to retain warmth may be estimated by multiplying the fill energy by the fill weight. Because of this a 900 fill energy jacket with 2 ounces of fill weight will be capable of lure about the identical quantity of warmth as a 600 fill energy jacket with 3 ounces of fill weight. The large distinction between them, and the explanation they’re priced otherwise, is the load of every and the packed measurement.

In jackets, the load distinction isn’t big. That is why a few of our favourite puffer jackets are 600 fill energy. In relation to sleeping baggage, although, issues are completely different. Since there may be much more down in a sleeping bag, the load distinction between equal quantities of fill energy is extra important. Except your funds is limitless, you’ll wish to take note of the warmth-to-weight ratio. How a lot heat do you want, and the way a lot weight do you thoughts carrying?

The one draw back to down fill weight is that some producers do not listing this. It sounds nice to say your puffer jacket as 900 fill energy down, however when you need to listing that it solely has 2 ounces of it, it sounds much less spectacular. Much less respected firms typically do not promote the fill weight. We listing fill weight of all of the jackets we check.

Different Elements to Take into account

Courtesy of REI

Whereas down fill energy and down fill weight collectively give us a strategy to evaluate objects, there are different issues to think about to get an thought of total heat. The third main issue is the baffles, the compartments which might be constructed into the product. If you happen to simply sewed up a single piece of nylon as a shell and shoved some down inside, gravity and motion would push all of it down close to the hem in a matter of minutes. To keep away from this, garment makers add baffles to maintain the down in place. Baffle sort and form play an enormous half in how heat your jacket, sleeping bag, or comforter finally ends up being.