Which down are the best ones?

Usually, the larger down are considered the best ones, because they provide better fill power values than smaller down, and therefore they can store larger amounts of air in between. Since larger down derive from big adult birds, usually geese provide top quality. But also big ducks supply fine quality- down. However, goose down show a slightly different structure under the microscope. Large goose down tend to be stronger and provide better fill power figures.

 

The unchallenged number one though is the eiderduck down which is the most high- grade and most expensive down deriving from rather small ducks. Even so, eiderduck down are larger than all other down and provide unmatched fill power figures and heat-insulation capacities.