Perhaps the most important part of your mattress. This affects how quickly you observe change over time. This is the "money" shot of mattress building.
Fox fact: The "average" leading name brand mattress uses a density of approx 8-10 oz. per cubic foot in their upper end models.
At Fox, the LEAST density we use in our mattresses is 1.8 pounds per cubic foot.
This is what affects how quickly a "sag" appears in a bed.
Determines the skeletal/posture alignment. Responsible for holding up the heavy parts of your body.
Hips - Abdomen - Shoulders
Choices of Steel Coil, pocketed springs, and 100% foam designs.
Gauge of wire is most important, NOT the coil count.