Experience support for more than just your body with the Harmony Lux 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 40% more support coils compared to Harmony models for even more head-to-toe support across the entire mattress, so you and your partner sleep undisturbed. Up to 100 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. InfiniCool® Lux technology helps you stay comfortably cool all night with its breathable, moisture-wicking fabric infused with cooling fibers and plant-based cooling technology. Pressure-relieving foams help ease aches and pains while also creating airflow throughout the mattress. Step-ups feature bio-charcoal cooling foam and 2x the memory foam 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 sleep each and every night.  With 40% more coils than Harmony models that offer increased support for any sleep position and undisturbed rest InfiniCool® Max Technology with three layers of cooling: cooling fibers, plant-based cooling technology on cover, and carbon-infused foam to keep you cool and comfortable Beautyrest® Active Response™ Memory Foam with contouring comfort for your body helps alleviate aches and pains caused by pressure A lush sleep surface made from up to 100 recycled plastic bottles collected by hand from oceans and within 50 km of coastlines. plastic bottles collected vary by model ranging from 60 to 105 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: Tight Top Mattress Type: Innerspring Included: 1 Mattress(es) Features: Wrapped Coils, Moisture Wicking, Adjustable Base Compatible, Breathable, Antimicrobial, Cooling Layer, Cushioning Layer, Foam Layer, Full Support, Temperature Regulating Additional Information: Conforms To Body, Eliminates Motion Transfer, Suitable for Adjustable Bed Frames, Relieves Pressure Points Coil Count: 635 Coils Manufacturer Warranty: 10 Year Limited Bed Size: Twin Measurements: 74.5 Length/Inches, 38 Width/Inches, 13.75 Depth/Inches Maximum Weight Limit: 1000 Lbs Base Material: 70% Metal, 30% Polyurethane Comfort Type: Medium Care: Spot Clean Certifications And Listings: Certipur-Us Certified, Seaqual Technology Country of Origin: Made in US Includes mattress only. Mattress plus box spring option also available.