The Serta® Serene Sky™ is a cooling and supportive mattress that delivers the kind of comfort you can trust from Serta®. Product Highlights Cool Twist® Gel Foam has cooling gel swirled directly into a breathable foam designed to promote airflow and heat dissipation. The Individually Wrapped Coil Support System provides contouring, cradling support and features Serta’s BestEdge® Foam Encasement technology – an extra-deep foam rail to help reduce edge roll-off and extend the sleep surface. Mattress Top Type: Tight Top Mattress Type: Innerspring Included: 1 Mattress(es) Features: Breathable, Cooling, Cooling Layer, Foam Layer, Wrapped Coils, Temperature Regulating, Cushioning Layer Additional Information: Conforms To Body, Eliminates Motion Transfer, Relieves Pressure Points, Suitable for Adjustable Bed Frames Coil Count: 324 Coils Manufacturer Warranty: 10 Year Bed Size: Twin Measurements: 12 Height/Inches, 40 Width/Inches, 76 Length/Inches Base Material: 100% Polyester Care: Spot Clean Certifications And Listings: Cpsc - 16 Cfr 1633 Compliant, Cpsc - 16 Cfr 1632 Compliant Country of Origin: Made in US Includes mattress only. Mattress plus box spring option also available.  This mattress meets the requirements of 16CFR Part 1632 (federal flammability (open flame) standard for mattresses and mattress pads This mattress meets the requirements of 16CFR Part 1633 (federal flammability (open flame) standard for mattress sets) when used with foundation