Pairing the Beautyrest Black Foundation with the Beautyrest Harmony Lux or Hybrid mattresses will extend the life of the mattress purchase and validate the manufacturer's warranty. These foundations are designed to provide support perfection for the mattresses and long-lasting comfort. The foundation framework consists of spruce with welded steel material and meets/exceeds both state and federal fire retardant standards. These foundations are constructed in coordinating fabric and are available in either standard (9") or low profile (5") heights. Consideration of a low profile mattress may be necessary to accommodate a lower overall height to the top of the bed with more exceptional mattress thickness or to accommodate particular headboards.