Slumber 1-8″ Mattress in a Box, Multiples Sizes: Tight top bed mattress with individual spring coils Revolutionary rebound technology lets the Mattress in a Box expand when unpacked Increased motion separation: springs provide undistributed rest Slumber 1 spring mattress is constructed to adjust individually to your weight and body shape Heavier gauge steel coil for durability and comfort with the Slumber 1 Mattress in a Box Mattress is tightly packed and vacuum sealed, please allow 72 hours to return to original shape Twin dimensions: 75″ x 39″ x 8″ Full dimensions: 75″ x 54″ x 8″ Queen dimensions: 80″ x 60″ x 8″ King dimensions: 80″ x 76″ x 8″ Also available: Smart Base Steel Bed frame in Twin/Full and Queen/King Beds sold separately; see our assortment of beds Bed frames sold separately; see our assortment of bed frames Great for platform beds; requires foundation or box spring with standard bed frames Foundations sold separately; see our assortment of foundations Slumber 1 Mattress in a Box includes a 10-year limited warranty Sleep more comfortably at night with a convenient Slumber 1-8” Mattress in a Box (Multiple Sizes). It is ready to use on platform beds and easy to set up for standard beds. The Slumber 1 Mattress in a Box features a firm and tightly wound top bed mattress with integrated individual spring coils that provide a customized feel that conforms to the shape of your body. The springs are spaced close enough to provide optimal support, yet far enough apart to increase motion separation and provide more undisturbed rest. The tight top mattress also features breakthrough rebound technology, meaning that the mattress is tightly packed when shipped to conserve space and naturally expands in just a few hours. Other bedding accessories, like foundations and bed frames, are available separately. Each Slumber 1-8” Mattress in a Box (Multiple Sizes) comes complete with a 10-year limited warranty.