1. First check the number of brand stores online and search the brand history.

2. Look at the appearance: whether the edge line is straight, the fabric has no jumper or the thread ends are loose, the fabric feel test, good fabric has the feeling of warm in winter and cool in summer, etc.

3. If you can touch the spring by touching the edge of the mattress, be careful to cut corners.

4. Check the warranty card and the manual to see if there is a detailed address, telephone number, web address, QR code, etc., what is the diameter of the spring, how many coils of the spring, and if it is an independent bag spring, ask how many components.

5. Try to lie down on the mattress, listen to the sound of spring vibration, and repeatedly lean on one side due to fabric stacking.

6. The mattress that can be used on both sides should be turned over to test the other side; For the mattress used on one side, see if another person can touch the spring, and be careful.

7. The test must open the plastic film of the packaging, and give up if you smell the glue.