TEMPUR-FLAT™ FOUNDATION Engineered to support your Tempur-Pedic® mattress with a perfectly solid, flat surface. Tempur Features: SOLID SUPPORT: Designed and engineered by Tempur-Pedic® to be stronger and more durable than any other support platform. LIGHTER DESIGN: Model is 30% lighter than previous construction, with no loss of weight capacity, strength or durability. MINIMIZES MOTION TRANSFER: Helps to minimize motion transfer between sleep partners. ANTIMICROBIAL TREATMENT: Hinders microorganisms, including dust mites. Note:Buy two pieces of Twin XL to make up one Split King Split Cal King is made up of 2 pieces. You must select a quantity of 2 for these sizes for a complete set. Other Features: Included: 1 Box Spring(s) Manufacturer Warranty: See Written Warranty for Full Details, 10 Year Limited Bed Size: Twin Measurements: 74 Length/Inches, 38 Width/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 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