Second smell: You can get close to the mattress to smell the smell of the mattress, a good mattress should not have any peculiar smell;
Have a look: a good mattress has a uniform appearance, a smooth surface, a well-proportioned line mark, and a standard product identification. The spring mattress depends on whether the interior is rusted and the texture of the filling;
Three lying: You can lie on the bed and feel it for yourself. Use the sleeping position you usually like, flip around on the bed a few times to see if there is any gap between the protruding part of the body curve and the mattress. If there is none, it proves the bed The cushion fits closely with the natural curves of your neck, back, waist, hips, legs, etc., allowing you to fully relax;
Four quantities: The size of the mattress should match the inner diameter of the bed, and the thickness of the mattress should not exceed the height of the bed frame.
