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. With the inclusion of premier materials and advanced sleep technology, Beautyrest Black® optimally aligns at the intersection of luxury and innovation for an extraordinarily comfortable sleep. 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 Contouring foam adheres to the shape of your body for night after night of exceptional pressure relief High-density, firm-feel comfort foam contours and conforms to your body, so you can experience a unique combination of comfort and support night after night  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: Pillow Top Mattress Type: Innerspring Included: 1 Box Spring(s), 1 Mattress(es) Features: Full Support, Cushioning Layer, Foam Layer, Cooling Layer, Temperature Regulating, Wrapped Coils Additional Information: Suitable for Adjustable Bed Frames, Eliminates Motion Transfer, Conforms To Body, Relieves Pressure Points Coil Count: 696 Coils Manufacturer Warranty: 10 Year Limited Bed Size: Twin Xl Measurements: 14.25 Height/Inches, 80 Length/Inches, 38 Width/Inches Maximum Weight Limit: 850 Lbs Base Material: 70% Polyurethane, 30% Metal Comfort Type: Firm Mattress + Box Spring Measurements: 80 Length/Inches, 23.25 Height/Inches, 38 Width/Inches Care: Spot Clean Certifications And Listings: Certipur-Us Certified Mattress Height: 14.25" 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.