1.Down：Down is a mixture of "feather" and "down". Feather is the stiff part of the whole mixture from duck or goose , which plays a supporting role in down and can make down rebound quickly; Down is down flower, which is the noumenon and value of down. Each down thread of down can be seen in the magnifying glass as fish scales, with unclear micro pores, containing a large amount of static air. Due to the lowest conductivity of air, the down has good thermal insulation, and the down is full of elasticity. Its lightness is 2.8 times of cotton and 2.2 times of wool. Therefore, down is not only soft and warm, And it feels good to touch the skin. In addition, down can absorb and discharge the sweat released by people constantly, so that the body is not moist and stuffy.
2.Filling Power：Filling Power is an important international measure of the warmth of down. It refers to the cubic inch of volume per ounce (30 grams) of down under certain conditions. If an ounce of down takes up 600 cubic inches of space, it is said to have a volume of 600. The higher the puffiness of down, it means that the down with the same filling volume can fix a larger volume of air layer for heat preservation and insulation, so the better the warmth retention of down.At Funotex, we could produce down products with Filling Power from 550 to 900.
3.Method for testing the puffiness of down：The content of down and the quality of down are the decisive and fundamental factors of feather fluffiness.Although the test method of the national standard is not the same, but its principle is the same, is to take a certain amount of samples in a cylinder, under a certain load to read the volume is the value of the fluidity.
4.Types of products suitable for down with different puffiness：
（1）The down with a puffiness of 550 is the most commonly used light heat insulation material, so it is light and warm to wear.
（2）The down with a puffiness of 600 is widely used in different temperature conditions. It is warm and comfortable and easy to carry.
（3）Fluffiness of 700 down, suitable for extreme cold temperature conditions, pay more attention to warm.
（4）The down with a puffiness of 800 has high thermal insulation, and has outstanding expansion and comprehensibility. It is more warm and lighter at the same time, and it has no burden to move.
（5）The down with a puffiness of 900, is currently on the market the best quality feather filling, as well as the industry recognized the absolute top of heat preservation material, not only has the incomparable warm weight ratio, and comprehensibility is good, super light in weight, and have heat preservation performance, due to the limited number and its, so many top for outdoor equipment.
