The Beautyrest Black® Series One Extra Firm mattress features the best of Beautyrest®, featuring advanced temperature management technology, premium foams, and advanced, Triple-Stranded Pocketed Coil® Technology for conforming support and motion separation. With the inclusion of premier materials and advanced sleep technology, the Beautyrest Black® Series One Extra Firm optimally aligns at the intersection of luxury and innovation for an extraordinarily comfortable sleep.