What kind of quilt is warmer?

In the north, when the cold winter comes, I believe that the happiest thing for people is to have a warm quilt. So what kind of quilt is warmer?

Generally, people think that the thicker the quilt, the more it can insulate the air and the warmer it is. In fact, this is not the case. The most important indicator of whether a quilt is warm or not is its air holding capacity.

The denser and fluffier the filling of clothes or quilts, it can store air in the filling space to the greatest extent, so that the air flow is relatively slowed down, ensuring that the cold air outside and the hot air inside are not exchanged, so as to achieve the effect of keeping warm .

The fiber structure of goose down is thin, long and very soft, with a very high bulkiness, which can effectively lock air and prevent the exchange of hot and cold air, so the quilt filled with goose down is very warm.