Designed with cooling gel memory foam, this mattress seamlessly blends value and convenience with the durability and trusted comfort Serta is known for. This collection offers all-foam and hybrid designs with 3 zones for lower back support and breathable fabric, so you wake up refreshed. Serta® Mattress-in-a-Box collection delivers comfort at a value with convenient delivery—so you can rest easy night after night.Only available in select models Firm - Ideal for stomach and back sleepers with extra support Convenient Delivery: Restful sleep delivered to your door—just unbox, unroll, and unwind. Breathable Fabric - A soft, breathable cover helps you rest and wake refreshed. 3 Support Zones - zones provide lower back support for classic comfort. Available in select models only Cool Twist® Gel Memory Foam - Cooling gel swirled into premium memory foam offers enhanced airflow, heat dissipation, and contouring comfort Serta® Foam Core: Durable, consistent support from edge to edge, so you're comfortably supported no matter your sleep position Assembled in USA Adjustable Base Compatible Mattress Top Type: Tight Top Mattress Type: Memory Foam, Mattress In A Box Included: 1 Mattress(es) Features: Cushioning Layer, Cooling Layer, Mattress In A Box, Foam Layer, Full Support Additional Information: Relieves Pressure Points, Conforms To Body, Suitable for Adjustable Bed Frames, Eliminates Motion Transfer Manufacturer Warranty: 10 Year Limited Bed Size: Twin Measurements: 74.5 Length/Inches, 38 Width/Inches, 10 Height/Inches Maximum Weight Limit: 850 Lbs Base Material: 60% Foam, 40% Polyurethane Comfort Type: Firm Care: Spot Clean Certifications And Listings: Certipur-Us Certified Country of Origin: Made in US Mattress arrives compressed in a box and then regains its size and shape after opening.