The down is long in the abdomen of geese and ducks, and it is a flower-like fluff of a reed, which is called a feather. Because down is an animal protein fiber, the down-ball fiber is densely covered with thousands of triangular pores, which can shrink and expand with temperature changes, and produce a temperature-regulating function, which can absorb the hot air flowing from the human body and isolate the cold air from invading. .
1.Advantage of down
In the four natural warm materials of cotton, wool, silk and down, the down warmth is the best. Natural down also has good moisture-absorbing and diverging properties that are not available in other thermal insulation materials. According to the measurement, when the body is sleeping, the body is constantly sweating outwards. The sweat of an adult emits about 100 grams per night. The down can continuously absorb and discharge the sweat released by the human body, so that the body has no moisture and sultry feeling.
2.Classification of down
Down is generally divided into goose down and duck down according to the source, according to the color is divided into white cashmere and gray cashmere, of course, in addition to the black cashmere produced by Icelandic eider duck and so on. In China, white duck down is enough to keep warm.
3.Fluffiness represents the "quality" of the down jacket
Bulkness is the number of cubic inches of volume per ounce (30 grams) of down. The larger the volume, the more air you hold and the warmer it is. That is to say, the higher the fluffiness of the down, the lower down feathers can fix a larger volume of air to keep warm and heat insulation, the down is more lightweight, and achieves an unparalleled warmth to weight ratio. Therefore, the weight of the down is not necessarily warmer than the lighter down, the level of bulk is an important indicator to measure whether a down is warm or not!
Fluffiness is generally divided into 550, 600, 700, 800 and 900. In the case of the same weight, these different fluffy down belts give you a different feeling! As shown below:
4.1. The fluffy 550 down is the most commonly used lightweight thermal insulation material, which is light and warm.
4.2. The fluffy 600 down, widely used in different temperature conditions, warm and comfortable, easy to carry
4.3.The downs of the fluffy 700, adapted to extreme cold temperatures, pay more attention to keep warm
4.4.The downholstery of the fluffy 800 has an ultra-high thermal insulation and outstanding expansion and compression. It is also lighter and warmer, and it is more affordable.
4.5.The downstain of the fluffy 900 is the best quality down filling on the market, and it is also recognized as the absolute top warming material in the industry. Not only has an unparalleled warmth to weight ratio, but also good compression, ultra-light weight, and amazing warmth. Due to the extremely limited number, it is mostly used for top outdoor equipment.