Experience the best of Beautyrest®, featuring advanced temperature management technology, premium foams, and advanced, Triple-Stranded Pocketed Coil® Technology for conforming support and motion separation. Micro Diamond™ Memory Foam offers a specialized upgrade for cooling comfort, as the foam, infused with heat-conducting diamond particles, is designed to help move heat away from the body for a cool sleep. With the inclusion of premier materials and advanced sleep technology, the Beautyrest Black® Collection optimally aligns at the intersection of luxury and innovation for an extraordinarily comfortable sleep. For the person who likes medium support with just the right amount of pressure relief Triple-Stranded Pocketed Coil® Technology offers our most advanced level of individualized support and motion separation, so you can rest undisturbed Specialized vertical fibers combine with an applied surface-cooling technology in an advanced feature designed to help transfer heat away from the body all night A layer of specialized foam is quilted into the sleep surface to unlock immediate, advanced pressure relief A premium memory foam, infused with diamond particles, is designed to help move heat away from the body for a cool sleep A unique, channeled design helps this high-density foam promote airflow for cool, enhanced pressure-relief Specifically designed to work together with your Beautyrest Black® mattress, this 9" Beautyrest Black® foundation offers long-lasting support and reduced motion for restful night’s sleep  Mattress Top Type: Tight Top Mattress Type: Innerspring Included: 1 Mattress(es), 1 Box Spring(s) Features: Foam Layer, Cooling Layer, Full Support, Wrapped Coils, Temperature Regulating, Cushioning Layer Additional Information: Conforms To Body, Eliminates Motion Transfer, Relieves Pressure Points, Suitable for Adjustable Bed Frames Coil Count: 696 Coils Manufacturer Warranty: 10 Year Limited Bed Size: Twin Xl Measurements: 15.5 Height/Inches, 38 Width/Inches, 80 Length/Inches Maximum Weight Limit: 850 Lbs Base Material: 70% Polyurethane, 30% Metal Comfort Type: Medium Mattress + Box Spring Measurements: 80 Length/Inches, 38 Width/Inches, 24.5 Height/Inches Care: Spot Clean Certifications And Listings: Certipur-Us Certified Mattress Height: 15.5" Country of Origin: Made in US Set includes mattress plus box spring/foundation. King and Cal. King mattress sets feature 2-piece side-by-side foundations for easier navigation in tight spaces.