Available in multiple sizes. Contact store for more details. A mattress foundation is the bed base that lifts your mattress off the ground, elevating your sleep (both figuratively and literally). A box spring foundation consists of steel coils encased in a wooden frame. The steel frame provides a high level of stability and support and serves as a shock-absorber. The coils also promote airflow through the material of the mattress for additional freshness. Disclaimer: Changes in production techniques may result in variation of actual product appearance. Please contact us for additional information.