What's the use of the looseness of down

The feather in the down jacket refers to the hair in other parts of the body except the down mentioned above. It is usually flaky with feather stem in the middle. The warmth of feathers is limited and not as good as fluff. Down content refers to the percentage of down and down silk filled in this dress in all fillings, feathers and down. For example, if you buy a down jacket filled with 90% white duck down and 10% white feathers, it indicates that the down content of the jacket is 90%

  when you decide to buy a down jacket, you must first look at the product label tied on the collar. If the down content is less than 50%, you should pay attention to it. It does not conform to the low standard of the national down garment rules. You must pay attention to the filling amount. The filling amount is different from the cashmere content. The cashmere content is calculated as a percentage, and the filling amount is the mass gram of practical feather + cashmere, which is related to the size, length, style and other elements of clothes.

  the down jacket I just bought is said to be filled with two liang, that is, 100 grams. Some friends like to buy down clothes with a large amount of down when they buy down clothes. They think it will be warmer if they are thick, but you must not underestimate the down content. Because the down itself has a great role in keeping warm, 80% of the down content is warmer than 75%.

   looseness looseness is an important index to measure the warmth level of down in the world. It refers to the cubic inch of volume per ounce (30g) of down under certain conditions. For example, if an ounce of down occupies 600 cubic inches of space, the looseness of the down is 600 Generally speaking, plump and mature birds have high looseness of down. On the contrary, small birds have low looseness.

  but what's the use of looseness? There is a saying that the filling amount represents the "quantity" of cashmere, and the cashmere content determines the "quality" of cashmere, and the looseness is also an important trade-off index. Under the condition of equal pile filling, the higher the number of tents, the better the function of keeping warm. Because the higher the porosity, the more heat-insulating air the down contains and the better the heat-insulating performance.