From the FF website:
“Origin
You can tell very little about the down is a sleeping bag from outside the shell, other than the relative fill power that is evident in the loft. FTC regulations even allow a percentage of duck down in down labeled goose, and although goose down is potentially better than duck, the best duck down is better than mediocre goose down. Down processors buy down from all over the world, basing the purchase decision of quality, price, and maintaining a long term relationship. The down may then be mixed to meet standards required by a manufacturer.
How is it obtained?
Down is commonly described as coming from mature, cold climate geese. In truth the climate the goose is raised in has very little to do with the quality of the down, and very little down comes from geese that you or I would call mature. Almost all down commercially available is a secondary product of geese raised for consumption. It would be prohibitively expensive to raise geese for down alone. Geese generally are hatched in the spring and slaughtered for poultry in the fall. A small number of breeder birds are kept through the year. These geese molt naturally in the spring. While their down is loose it is collected by hand. This is the down used in Feathered Friends sleeping bags and jackets. It is very rare and , of course, expensive.
What is the difference in quality?
There are other important measurements of down quality. In other parts of the world the percentage of whole down pieces verses feather and fiber has traditionally been the measure of down quality. Down with 95% cluster is about as good as you can get, and even down with 80% cluster would pass as “all down”. Cleanliness is important also, contaminants cause odors, shorten the life of the down, and can cause allergies.
Recovery from compression used to be regarded as an important property to measure. With high fill power down, you can be pretty much rest assured that care has been taken in cleaning and separating the down, otherwise you simply would not get the high fill power figures. The premium 700+ to 800+ fill are both quite different from 550+ to 650+ fills. Down is commonly described as coming from mature, cold climate geese. In truth, the climate the geese are raised in has very little to do with the quality of the down, and very little down comes from geese that you or I would call mature.
Almost all down commercially available is a secondary product of geese raised for consumption. It would be prohibitively expensive to raise geese for down alone. The “mature” geese that are the source for lower fill down are about four months old when they are “harvested” for food. Down from these geese can be carefully sorted, washed, and blended, but it will never loft like really mature down. In addition, there are differences in the breed of geese. 800+ fill is a more mature, more carefully selected type of down that makes up the 700+ fill. The larger individual plumes are what gives you the greater loft. The only way to get down of this quality is by careful hand selection. This is the major factor in its scarcity, not the lack of mature geese. Farms that want to produce the highest quality down must raise the right geese, feed them properly, let them become mature, and then carefully gather the down. Very few poultry farmers want to go through this trouble.
Some of the 700+ down fill we use comes from a small number of birds kept for breeding purposes throughout the year. These geese molt naturally in the spring. While their down is loose it is collected by hand. It is very rare and, of course, expensive. Down processors are very secretive about their sources. We will probably never be able to determine how much of our down is “live plucked” and how much is collected from the geese that are eaten.”
Here’s how to find it for yourself. I used the Merlin bag to locate it, but you can prob. find it from most/all of the bag’s web pages. Click the “800 Fill Upgrade” & then click the “Orgin” (sic) tab. The above quoted paragraphs are copied and pasted directly from there.
Here’s a link to start y’all off ==> Origin of FF down