Experience support for more than just your body with the Harmony Collection. Innovative materials work harmoniously to bring you restorative sleep with improved support, advanced motion isolation, and a lush cover made from plastic bottles diverted from the ocean. The Precision Support System™️ offers consistent support across the entire mattress, from head to toe, so you and your partner sleep undisturbed. Up to 50 plastic bottles collected by hand from coastlines and ocean-bound waterways* have been transformed into premium fabric to create a lush, durable sleep surface that helps contribute to cleaner water. A breathable, moisture-wicking fabric helps you sleep comfortably throughout the night. Pressure-relieving foams help ease aches and pains while also creating airflow throughout the mattress. Step-ups feature the additional cooling comfort of InfiniCool® and premium foams for enhanced pressure relief. All models are crafted with a lofty, quilted top, making them perfect for those who prefer a lifted feel and want rejuvenating to sleep every night. *Collected from areas within 50km of coastlines. Plastic bottles collected vary by model ranging from 30 to 50. Individually pocketed coils provide consistent head-to-toe support and advanced motion isolation for any sleep position. Premium cooling for comfortable sleep with a breathable, moisture-wicking fabric and InfiniCool® technology containing cooling fibers. Premium Beautyrest® Active Response™ Memory Foam with contouring comfort for your body to help alleviate aches and pains caused by pressure. A lush sleep surface made from up to 50* recycled plastic bottles collected by hand from oceans and within 50 km of coastlines. *Plastic bottles collected vary by model ranging from 30 to 50. Adjustable base friendly - helps reduce snoring and makes reading or watching tv more comfortable. We stand by our beautyrest mattresses with a 10-year limited warranty. All our mattresses are proudly assembled in the USA.  Mattress Top Type: Pillow Top Mattress Type: Innerspring Included: 1 Mattress(es), 1 Box Spring(s) Features: Cooling, Cooling Layer, Wrapped Coils, Full Support, Antimicrobial, Cushioning Layer, Temperature Regulating, Foam Layer Additional Information: Eliminates Motion Transfer, Relieves Pressure Points, Suitable for Adjustable Bed Frames, Conforms To Body Coil Count: 439 Coils Manufacturer Warranty: 10 Year Limited Bed Size: Twin Maximum Weight Limit: 1000 Lbs Base Material: 70% Metal, 30% Polyurethane Comfort Type: Plush Mattress + Box Spring Measurements: 23.75 Depth/Inches, 38 Width/Inches, 74.5 Length/Inches Care: Spot Clean Certifications And Listings: Seaqual Technology, 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.