Why worry when you can chime? With the Sierra Sleep® Chime hybrid innerspring king mattress, you have endless possibilities for restful sleep. You get the best of both worlds—the pressure relief of cooling gel-infused memory foam, coupled with body contouring pocketed coils for superior support. Rest assured that high density quilt foam provides the comforting feel you love. Plus, this mattress arrives in a box for quick easy setup. Simply bring it to your room, cut away the plastic wrap, and unroll. You’ll be amazed at how it fully expands within minutes. Foundation/box spring available, sold separately. Mattress Type: Innerspring, Mattress In A Box Included: 1 Mattress(es) Features: Cooling, Quick Ship, Cushioning Layer Coil Count: 377 Coils Bed Size: Twin Measurements: 74.41 Length/Inches, 37.99 Width/Inches Base Material: 80% Polyester, 15% Metal, 5% Other 5% Or Less Comfort Type: Firm Care: Spot Clean Country of Origin: Imported Visit our Furniture & Mattress Customer Care Center for delivery options, protection plans and other services. Problem with an order or need help with a return? Our Furniture & Mattress Customer Service agents will be happy to help. Give us a call at 1-800-442-7902 Don’t forget to print off your delivery checklist to avoid any delays or issues when delivering your item. Signature Design by Ashley is a registered trademark of Ashley Furniture Industries, Inc. Quick Ship items ship directly from the manufacturer within 3 to 5 business days.