A champion of comfort for all, Serta, inc. ("Serta") has pioneered sleep innovation for more than 90 years, bringing quality products to more than 150 countries worldwide. Every bed across the Serta's® portfolio is designed to provide superior comfort, including the award-winning iComfort® collection. iComfortECO™ features select materials that are up to 70% sustainable*, this supportive foam mattress was designed for sleep that's cool, comfortable, and restorative-with upgrades available for even more cooling, comfort, and pressure relief. *Sustainable refers to plant-based foams & recycled fibers and varies by model. See  serta.com  for details. Mattress Top Type: Tight Top Mattress Type: Hybrid Included: 1 Mattress(es), 1 Box Spring(s) Features: Gel, Cooling Layer, Foam Layer, Cushioning Layer, Antimicrobial, Temperature Regulating, Adjustable Base Compatible Additional Information: Suitable for Adjustable Bed Frames, Conforms To Body, Eliminates Motion Transfer, Relieves Pressure Points Manufacturer Warranty: 10 Year Bed Size: Twin Xl Maximum Weight Limit: 1000 Lbs Base Material: 75% Foam, 25% Metal Comfort Type: Plush Mattress + Box Spring Measurements: 79.5 Length/Inches, 40 Width/Inches, 21.5 Depth/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.