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. Firm feel - ideal for stomach and back sleepers with extra support for heavier sleepers. Cooltemp cover powered by repreve. This cool-to-the-touch, breathable cover is made with recycled plastic bottles. Terra fusion memory foam. Foam made from 30% plant-based material that provides pressure relief and reduced motion transfer for uninterrupted sleep. 1000 series 5-zone quad coil support system - made with 85% recycled steel, provides targeted pressure relief and support for your back and thighs-and cradles you everywhere else. Recycled fiber base - compressed recycled fiber provides a supportive base under the mattress core. 100% usa assembled, certipur-us certified, powered by repreve Designed and built in usa Mattress Top Type: Tight Top Mattress Type: Hybrid Included: 1 Mattress(es), 1 Box Spring(s) Features: Breathable, Temperature Regulating, Antimicrobial, Cushioning Layer, Cooling Layer, Foam Layer, Adjustable Base Compatible Additional Information: Conforms To Body, Suitable for Adjustable Bed Frames, 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: 23 Height/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.