Secondly, it is puffiness.

Down jacket is usually composed of fabric layer, down fabric (filler) layer and lining layer.
These three layers of structure will have an impact on the thermal insulation effect of the down jacket.
Today, we mainly analyze why there is such a huge gap through the impact of down on the warm keeping effect of down jacket.

Feather is long on the abdomen of geese and ducks, forming reed flower like hairs, called feathers in sheets.
As down is a kind of animal protein fiber, thousands of small triangular pores are densely distributed on the down spherical fiber, which can shrink and expand with the change of temperature to produce the temperature regulating function, absorb the flowing hot air emitted by the human body, and isolate the invasion of the outside cold air.

■ Fluffy degree
The fluffy degree of down directly determines the amount of static air that the down liner can hold, thus affecting the warmth retention of down jacket.
The down content and filling density affect the fluffy degree of down.

The fluffy degree is a key indicator to reflect the quality of down. Down products mainly depend on the fluffy effect of finished products, that is, the degree of expansion;
It is doomed that down should be measured by volume rather than weight, so the thinner the down jacket is, the warmer it will be. Because after the down jacket is filled, it needs some space to "expand" itself to make you warm.

What is the pile content?
Down content refers to the percentage of down in the total filling of a down jacket. If the down content of a down jacket is 90%, it means that down accounts for 90% of the padding, and the remaining 10% is feathers.
Generally speaking, 90 down is a kind of down jacket, which is of good quality!

Generally speaking, if the down content is less than 50%, it cannot be called "down jacket". Under the same conditions, the higher the down content, the better the warmth retention, and of course the higher the price.
Of course, it is not only the pile content, but also the "filling amount" that determines the warmth retention and price.
What is the filling amount?
The filling amount actually refers to the weight of all the down filled by a down jacket, that is, the weight of the "down" inside the down. It is different from the "pile content" mentioned above. The former is a proportional value, and the latter is a simple weight value.

It is the key factor to determine the quality and thermal insulation performance of a down jacket under the same conditions (type, fluffy degree, filling amount, etc.). The higher the filling amount, the better the thermal insulation performance of the down jacket.
The amount of down filling basically determines the use of a down jacket. Based on the principle of on-demand selection, we divide down jackets into four grades according to their thermal insulation performance. Of course, this is only a rough division for amateurs.

Light or not, depending on the filling amount
In fact, there is a misunderstanding here. Many people think that the higher the filling of down jacket, the warmer it will be. In fact, the heat preservation mainly depends on the fluffy degree. If the filling amount is large but the fluffy degree is not high, it may not be very warm, but it must be heavy, like a big quilt.
When we choose down jackets, another important requirement is that they should be light, that is, the filling amount should not be too high. After all, in winter, who wants to wrap himself up as a bear?

For example, the filling capacity of Uniqlo's short down jacket is about 30g. The filling capacity of the short down jacket of Sportmax, Maxmara sub line, is 132g. So Uniqlo is an ultra light everyday style. Sportmax is more like the bread and down jacket of the fire in recent years, which looks heavier and more suitable for people who are afraid of the cold~