The Beautyrest® Black Foundation will provide durability as well as the perfect support for the Beautyrest® Harmony Lux and Hybrid mattresses, by design. Specified by the manufacturer, the pairing and purchase of the foundation validate their warranty for the corresponding mattresses and will help extend your purchase's life. These Beautyrest® foundations meet or exceed any state or federal fire standards and come in coordinating fabric and standard or low profile height. A low profile height may be a consideration if the mattress is thick, or if there could be interference with the headboard that is being used for the bed.