Feathers can be divided into "feather" and "velvet":

In the feathers, the feathers have a central axis called the “bone shaft”, and the “bone shaft” has two rows of hard “feathers” called feathers. The main function of "Feather" is to sway the air while the birds are flying, to help fly and to support the birds in the air.

"Fleece" is a feather without feathers in the feathers. It is composed of a number of slender and soft filaments that are irregularly gathered at a central point and attached to the body of the bird. When the filaments of each center point are scattered in the air, they are shaped like flowers, so it is called "velvet". The main function of "velvet" is to maintain the body temperature of birds.

Birds or poultry have "feathers", but only waterfowl and some birds that live part of their lives in the water have "velvet" such as ducks and geese. "Fleece" grows more in the chest, abdomen, neck and axilla of waterfowl. Mainly to maintain the body temperature of waterfowl while swimming.

“Fleece” is the only natural best and lightest insulation material. "Fleece" itself can not produce heat, its insulation function is mainly because each velvet has a lot of soft fluff, when the velvet spreads out to form a three-dimensional pompom, the best temperature insulation air, wrapped In this pom-pom; thus becoming a top-of-the-line warm bag, in addition to preventing body temperature leakage, it can also resist the invasion of cold air outside.

Birds have long known that "feather" and "velvet" are mixed together to build a nest. When humans steal the eggs, they accidentally find that the mixture of "feather" and "velvet" is very soft, comfortable and warm, and they start collecting. "Fleece" is applied to warm clothing and clothing.

At present, the "velvet" used by humans is mostly collected from water poultry, such as ducks and geese. In terms of volume, the goose down "velvet" is larger and the price is higher; the main reason is that the cost of raising the goose is more expensive.

In terms of warmth, there is basically no difference between duck down and goose down. Because "velvet" itself cannot produce heat. The degree of warmth of clothing depends mainly on the following factors:

1. The bulkiness of the "velvet" itself, which directly affects the amount of air that can be wrapped around the best insulation object.

2. The quantity of "velvet" contained in the finished product.

3, the design of the clothing, which includes the fabric, style and structure of the clothes used.

Because of the need to protect the interests of consumers and determine the extent of warmth of finished products; different regions and countries have different regulations. It is also required that each finished product needs to clearly indicate the amount of cashmere and the composition of the finished product on the label.

Under normal circumstances, the standard adopted by the general commercial is 80/20 goose down for each ounce, which should occupy 500 cubic inches of space in the fluffy case. The higher the bulkiness, the better the degree of warmth. The quality products are marked with 600 or 700 words respectively.

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