Experience the trusted comfort of Serta with Serta® Classic®. Featuring a soft, breathable cover, Pillowsoft® Aire Foam, and an 800-density coil support system, this mattress helps you sleep comfortably and wake ready to ease into your day. With 3 zones for lower back support, plus a gel memory foam upgrade for even more pressure relief, this mattress balances cool breathability with responsive support and pressure relief for a classically comfortable rest. Firm - ideal for stomach and back sleepers with extra support for heavier sleepers. Breathable cover a soft, breathable cover helps you rest and wake refreshed. 3 zoned body support offers 3 separate zones to provide lower back support for Classic comfort. A breathable memory foam helps enhance airflow and heat dissipation for a feeling that can only be described as a cool, contouring type of comfort. This 800-coil density system provides contouring, cradling support and minimizes motion transfer. Certipur-US® Certified. Designed and built in USA. Adjustable friendly. 10 year warranty  Mattress Top Type: Tight Top Mattress Type: Innerspring Included: 1 Mattress(es) Features: Cushioning Layer, Cooling Layer, Wrapped Coils, Foam Layer, Full Support Additional Information: Suitable for Adjustable Bed Frames, Relieves Pressure Points, Conforms To Body, Eliminates Motion Transfer Coil Count: 324 Coils Manufacturer Warranty: 10 Year Limited Bed Size: Twin Measurements: 38 Width/Inches, 12.5 Height/Inches, 74.5 Length/Inches Maximum Weight Limit: 850 Lbs Base Material: 70% Polyurethane, 30% Metal Comfort Type: Firm Care: Spot Clean Certifications And Listings: Certipur-Us Certified Mattress Height: 12.5" Country of Origin: Made in US Includes mattress only. Mattress plus box spring option also available.