It should start from the function of the mattress. The function of a mattress is to ensure that consumers get a healthy and comfortable sleep.

There are two standards for a good mattress: one is that the spine can stay straight and stretched regardless of the sleeping position of the person; the other is that the pressure is equal and the person lies the whole body can be fully relaxed. This involves the softness of the mattress.

The hardness of the mattress depends on the hardness of the liner spring. In addition to the necessary hardness to play a supporting role, the spring should also have good resilience, so-called rigid and flexible.

When the mattress is too hard, then the body is not completely settled. The spine is actually in a state of stiffness and tension, which not only fails to achieve the best rest. Effect, and sleeping on such a mattress for a long time can be detrimental to health.

A mattress that is too soft will sag as soon as the person lays down, and the spine will be in a bent state for a long time, which will cause pressure on the internal organs for a long time, which is also not good for health and uncomfortable.

Therefore, mattress which lies in between in terms of firmness that is soft and hard mattresses should be used.