How to pick up a good down product?

Look at these 5 parameters when buying a down jacket!
1. Filling material
Generally, goose down has better performance than duck down in warmth.
2. Down content
50% < 70% < 80% < 90%
The higher the down content, the higher the fluffiness and the warmer it is

3. Filling weight
The bigger the filling weight is, the better the warmth is
4. Filling power
The volume of down per ounce in its natural form. The filling power of down jackets is generally between 550-900FP. For down of the same quality, the higher the fluffiness, the more air it stores and the stronger its heat storage capacity.

5. Fabric
High-density nylon: It is the first choice for down jacket fabrics, which is windproof, water-proof and thin.
Functional fabrics: self-heating, temperature-locking and heat-storing technology fabrics make down jackets warmer.
Natural fiber fabrics: natural materials such as wool, cashmere, and sheepskin increase the warmth and luxury of down.