Quote:
Inner spring = Although these beds are a cheapest, they are also the most predictable to cause disomfort down the road due to sagging.
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Depends on the type of spring, the number of coils, the number of turns, the wire gauge, and size/wt of the people. Google "mattress forum" and there's a good forum for asking questions.
If the innerspring is adequate, it will be the foam that will pack down and sag first.