According to a recent report by CCTV News, many so-called "down jackets" actually use fillings that are filaments rather than real down. Such fillings are usually made by removing shredded hairs from birds and pulverizing them.

These merchants may acquire second-hand badminton balls from different regions, disassemble the feathers on them, and then reassemble the crushed feathers into new fillings.

Industry insiders say that the knife feather fiber is very slender and tough, and it can be used to fill down jackets or bedding such as pillows and cushions after being crushed. However, because the knife feather feathers are painted with thick glue, the glue will also be crushed, resulting in a large amount of dust. This dust can have adverse effects on people's cardiopulmonary function. In addition, experts point out that if the human body inhales air containing a lot of dust, it may lead to respiratory diseases.

Therefore, consumers should choose carefully when purchasing such products and avoid exposure to such harmful substances. At the same time, relevant departments should also strengthen market supervision and management, crack down on the production and sales of counterfeit and shoddy products, and protect the legitimate rights and interests of consumers.