Elevate your sleep to a luxurious reward night after night. As a part of our most advanced collection yet, Beautyrest Black® L-Class 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, our patented memory foams unlock immediate pressure relief and personalized support. 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: Tight Top Mattress Type: Innerspring Included: 1 Mattress(es) Features: Cooling, Cooling Layer, Cushioning Layer, Foam Layer, Temperature Regulating, Wrapped Coils, Full Support, Antimicrobial, Non-Toxic, Adjustable Base Compatible Additional Information: Eliminates Motion Transfer, Conforms To Body, Relieves Pressure Points, Suitable for Adjustable Bed Frames Coil Count: 513 Coils Manufacturer Warranty: 10 Year Bed Size: Twin Xl Measurements: 39 Width/Inches, 13.5 Height/Inches, 79.5 Length/Inches Maximum Weight Limit: 1000 Lbs Base Material: 50% Wood, 50% Metal Comfort Type: Medium Care: Spot Clean Certifications And Listings: Certipur-Us Certified Mattress Height: 13.5" 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. Includes mattress only. Mattress plus box spring option also available.