The main materials of down jackets are down and coated fabrics. ① Down: a mixture of small pinnae and down (also called down). The former is called feather, and the latter is called velvet. The feathers of ducks and geese are mostly used, and after selection and washing, the small pinnae and down are separated and used as wadding for down jackets. There are two types of down: gray and white, the white one is better. The quality of down jackets is related to the amount of down filling and down content. Down filling refers to the weight of down in a down jacket, expressed in grams, usually about 250 grams. The filling amount is small and the warmth retention is poor; down content refers to the down content in the down, expressed as a percentage, and the general down content is It is 50~80%. The higher the cashmere content, the better the quality. Because velvet can prevent human body heat from dissipating easily and has a soft feel, it is not easy to bulge in time when it is pressed and wet. At this time, the small pinnae can make the clothes fluffy and bulge to keep more air in the clothes, which is useful. It helps to keep warm, but there are too many small pinnae, the heat is easy to escape, and it has a hairy feel. Therefore, the down and pinnae must be eclectic and proportioned appropriately. ② The coated fabrics are made of silk, cotton, cotton-polyester and other fabrics with high warp and weft yarn density. They are rolled and pressed to reduce the gaps between the warp and weft yarns, and then coated with polymer slurry to form a transparent film cross-linked with the fabric. Covering layer to close the gaps in the warp and weft of the fabric. Some add fluorophosphorus resin or silicone waterproofing agent to the coating slurry to make the fabric anti-dendr and anti-water seepage. In the 1980s, special uncoated ultra-high-density fabrics were available, which can also prevent velvet, water seepage and breathability. The fabrics used for down jackets are divided into two categories: hard and soft. Polyester, polyester card, and cotton are hard materials and are smooth to wear; silk poplin and nylon are soft materials and are soft and comfortable to wear.