The 100-year history of down jackets is an evolution of pragmatism Down Jacket, "Down" refers to the small, fluffy layer of feathers closest to the skin and lowest in a bird's body, and is most effective when made from down. Although there have been documented cases throughout history of down being added to clothing to keep warm, the earliest technical example of true down outdoor clothing dates back to 1922 when George Finch, wearing a bulky down jacket made from green ballooning fabric, set a new record for the highest ascent of Mount Everest with plenty of oxygen and warmth. Record: 8360 meters above sea level. Thirteen years later, Eddie Bauer, a manufacturer of tennis, golf and fishing equipment, survived hypothermia on a fishing trip and decided to make a more suitable suit. He imitated the Soviet army's practice of stuffing bird feathers into jackets to keep warm, but soon they were all sinking to the bottom of his clothes and did little to keep him warm. He came up with a sewing method, with diamond-shaped threads that spread the down evenly across the jacket and threaded collars and cuffs to retain the heat better, which he patented in 1939 and which Eddie Bauer called "Skyliner". In the 1940s, Eddie Bauer adapted his jacket technology for military use, designing a B-9 flight jacket for the US Air Force that, with matching trousers, could maintain normal body temperature for up to three hours at -56°C. This was the beginning of the down jacket's extension into a wider field. American designer Norma Kamali found this method of keeping warm to be effective when she emerged from a camping trip in the 1970s, late at night when the forest was chilly and she wore a sleeping bag to her tent. She deconstructed and reconstructed a knee-lowering down coat that made down's march into the fashion world. As technology evolves and the outdoors rises, the core of down jackets remains warm, portable and functional With nearly a century of technological advances, the manufacture of down jackets has become very sophisticated. In addition to the name Down Jacket, there is another name is Puffer Jacket, which means it is like an inflatable fluffy jacket, and with the rise of outdoor sports, winter clothing should play an important role, warmth and functionality, so that winter sports have more possibilities. Nowadays, with the application of new fabrics such as GORE-TEX, nano-thermal insulation material, down filling method and down locking technology, down jackets have become more flexible and portable, giving users a more advanced wearing experience. In the world's finest down producing regions: Poland, Hungary, Czech Republic and China, a large portion of the down between the chest and the belly is chosen to achieve a high degree of fluffiness. With the Swiss Blue Label certification and the international RDS-certified specifications, the down industry is constantly evolving. In the case of down, the hardness of the German Defence needles is increased and the needle holes are thinner, which prevents the fabric from being damaged by the heat during the sewing process. The precision stitching of 3cm 13 stitches and the high-density microfiber inner lining make the down "no place to hide", prevent the down from digging in and lock in the heat.