In principle, the down of goose is stronger, bigger and more resistant than the down of duck.

The quality of down is a function of its origin and the local climate. The Eider down comes from a wild duck who  nests in Iceland and produces the best down, of an universally recognized quality. However its rarity gave it an unapproachable price.

The good down always straightens itself, this shape resistance assures the necessary air spaces. The capacity of replenishment is a measure of the down quality. It is also this capacity of replenishment that makes the difference between the down and the feather. Feathers are flat and therefore don't permit to keep as much air.

One recognizes a feather containing quilt by the presence of the stems. Finally, last advantage of the down quilt: with him finished the task of the beds to make: you shake the quilt once and it is finished!