Goose down, good quality, elastic foot, strong warmth, better moisture absorption, sweat permeability, relatively dry, and higher loft. Goose down refers to the downs which are used as fillers in the cold-proof articles. It is the part under the goose and under the belly, taking its fluffy type of fluff. Goose down not only has good warmth and softness, no pressure and sultry feeling, but also has moisture wicking function. Goose down is an animal protein, which has higher heat preservation capacity than plant fiber such as cotton. The three-dimensional triangular skeleton structure of down can store a large amount of air, and the air itself is a poor conductor, so it can resist external cold and human body temperature loss. .