The Beauty Sleep® 11.5" medium hybrid mattress is designed for your lifestyle. With a smooth top panel, our Beauty Sleep® 11.5" medium hybrid mattress features allcool™ gel foam and allcool™ gel memory foam that contours to your body for the ultimate pressure relief. Our premium foams provide a responsive sleep surface for all-night comfort, support, airflow, and breathability. Plus, firm 815 Original Beautyrest® Pocketed Coils provide consistent, supportive sleep at a value designed for your lifestyle. Medium smooth top hybrid Featuring firm 815 Original Beautyrest® Pocketed Coil Technology for consistent, comfortable support Allcool™ gel memory foam is a premium gel memory foam that contours to your body for the ultimate pressure relief Allcool™ gel foam is a soft gel foam that helps provide comfort, Support, airflow and breathability All Beauty Sleep® mattresses are built with CertiPUR-US® Certified foams. All Beauty Sleep® mattresses are assembled in the USA All Beauty Sleep® mattresses are compatible with adjustable bases All Beauty Sleep® mattresses have a 10 year limited warranty  If you are looking to add a little height to your bed or just simply extend the life of your Beauty Sleep® mattress, the 9" Beauty Sleep® flat mattress foundation is the perfect solution. Designed to provide long-lasting comfort, the Beauty Sleep® flat bed foundation includes a spruce framework and welded steel elements for greater support and durability.  Mattress Top Type: Tight Top Mattress Type: Hybrid Included: 1 Mattress(es), 1 Box Spring(s) Features: Cushioning Layer, Wrapped Coils, Cooling Layer, Foam Layer, Full Support Additional Information: Suitable for Adjustable Bed Frames, Eliminates Motion Transfer, Relieves Pressure Points, Conforms To Body Coil Count: 324 Coils Manufacturer Warranty: 10 Year Limited Bed Size: Twin Measurements: 11.5 Height/Inches, 74.5 Length/Inches, 38 Width/Inches Maximum Weight Limit: 850 Lbs Base Material: 70% Polyurethane, 30% Metal Comfort Type: Medium Mattress + Box Spring Measurements: 20.5 Height/Inches, 74.5 Length/Inches, 38 Width/Inches Care: Spot Clean Certifications And Listings: Certipur-Us Certified 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.