The most common fillers in down jackets are goose down and duck down, which can be divided into white down and gray down according to color. According to the price, the down jackets on the market are ranked as follows: white goose down>grey goose down>white duck down>grey duck down. It may be affected by the sorting of price, so many people think that the quality of these fabrics is also sorted in this way. In fact, it is not. Through theoretical research and practical experience on down, generally speaking, goose down with the same quality and content is better than duck down in terms of warmth retention and fluffy degree, but the color has little to do with the quality of down jacket.