Elevate your sleep to a luxurious reward night after night. As the premier offering in our most advanced collection yet, Beautyrest Black® K-Class now offers up to 21% more support where your body needs it the most. With help from our new plant-based cooling technology, the collection provides up to 18% more cooling power to keep you comfortable as you fall asleep and all night long. In addition to our support and cooling systems, Beautyrest Black® K-Class includes comfort, pressure-relieving and support upgrades as well as 10X more memory foam compared to Beautyrest Black® L-Class and C-Class models for our most comfortable mattress ever. A luxurious layer made with silk, alpaca and cashmere provides unmatched comfort and breathability while Self-Response™ Latex ensures individualized support for different parts of your body. Lasty, 2000 micro-coils add an additional layer to our Premier Support System and provide precise conformability. These innovative features are paired with an all-new modern design to create a first-class sleep experience that will leave you feeling invigorated to take on your day. Mattress Top Type: Pillow Top Mattress Type: Innerspring Included: 1 Mattress(es), 1 Box Spring(s) Features: Cooling, Foam Layer, Temperature Regulating, Full Support, Non-Toxic, Antimicrobial, Wrapped Coils, Cushioning Layer, Cooling Layer Additional Information: Suitable for Adjustable Bed Frames, Relieves Pressure Points, Conforms To Body, Eliminates Motion Transfer Coil Count: 513 Coils Manufacturer Warranty: 10 Year Bed Size: Twin Xl Maximum Weight Limit: 1000 Lbs Base Material: 50% Metal, 50% Wood Comfort Type: Firm Mattress + Box Spring Measurements: 39 Width/Inches, 24.75 Depth/Inches, 79.5 Length/Inches Care: Spot Clean Certifications And Listings: Certipur-Us Certified Country of Origin: Made in US Visit our Furniture & Mattress Customer Care Center for delivery options, protection plans and other services. Problem with an order or need help with a return? Our Furniture & Mattress Customer Service agents will be happy to help. Give us a call at 1-800-442-7902 Don’t forget to print off your delivery checklist to avoid any delays or issues when delivering your item. 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.