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Connections between the coils corrective the mattress retain its shape. Scottsdale Mattress Most coils are connected by interconnecting wires; pocketed coils are not connected, but the pockets preserve the mattress shape.

* Box-springs consist of a rigid frame which contains extra-heavy-duty springs. This type of foundation contributes to softer bedding and a bouncier mattress. Because box-springs can end mattresses to sag, many manufacturers subtract high-density block foam underneath the coils or provide a rigid foundation instead.