In Iran and in the Persian language, jackets made of natural bird feathers are called "feather jackets". This garment is warm and soft, which is made of insulation with natural feathers. The down used in the jacket may be from goose, duck or a combination of both, although usually the body down of larger birds is better. Goose down is often considered the warmest and lightest fiber, but clothing made from duck down or a combination of the two may be slightly cheaper.
قدرت آکندگی یا میزان پف کردگی fill power پر چیست؟
The filling power or the amount of puffiness in the feather is one of the important features to measure the quality of its performance as an insulator. The higher the filling power is, the more warm air it retains in a smaller quantity and weight. Up to 550 good, up to 750 very good, up to 900 excellent. For this test, one ounce (equivalent to 28 grams) of crack is pressed into a glass cylinder. The ability to return to the previous state and refill the cylinder is calculated as "filling power".
Higher filling power also indicates The quality of the feather is high. Since at a high level of filling power, a smaller amount of down is needed to fill a certain space, jackets made of down with high filling power are lighter and warmer and have high packability and compression.
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