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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.

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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.