What is pocket-spring? advantage?

Independent coil mattresses are composed of many independent springs, each spring is packaged in its own bag, so that the springs can operate independently without interfering with each other. This design is called "independent coil" spring mattress.

This design allows the mattress to provide more stable support and better fit when in use, because the springs can be individually compressed and supported according to the pressure of the body part, providing more support that conforms to the human body curve. This mattress design also helps to reduce the shaking sensation of the mattress, providing a better quality of sleep for couples.