1. Check whether there are registered trademarks, product specifications, product appearance, sewing quality and bulkiness, and whether there are inspection reports issued by quality supervision and inspection institutions at or above the provincial level authorized by the national quality and technical supervision department;

2. Relax and flatten the down jacket, press down the down jacket with your hands, and then release your hands to see if the down jacket can rebound quickly and return to its original state. If you can't rebound or rebound slowly, the rebound height is very low, indicating that the quality of the filled down is not good. If there is no toughness, it belongs to fake and shoddy products;

3. Touch the down jacket by hand to test the softness of the down jacket and whether there is a complete small piece of wool. If it feels soft and has a complete small piece of wool, it is a good product;

4. Tap the down jacket gently with your hand to see if there is dust overflowing at the seam. If there is no dust overflow, it is a good product;

5. Rub the front and back of the down jacket with both hands to see if there is fluff;

6. Sniff the nose close to the down jacket, and then compare it with the normal down jacket to check whether there is fishy smell or difference;

7. In general, the lighter the weight, the larger the volume, indicating that the higher the cashmere content, the better the quality. On the contrary, the quality is worse.