How to choose a RIGHT down sleeping bag? Secret 2——The Fluidity
Let’s have a look into some home supplies that are filled with down: down quilt, down jacket.
If you go around in a shopping mall and have a look at those down quilts or down jackets, you’ll find out that they are all design as a cloth that has many squares on it,no matter the brand or price.
So, why are all these down products has squares on it?
The answer is: Because ...
