ZINUS 9 Inch Metal Smart Box Spring with Quick Assembly, Mattress Foundation, Strong Metal Frame, Easy Assembly, Twin XLAs the backbone for solid mattress support, a box spring that falls short can make or break your nights sleep. We developed the Smart BoxSpring with unbeatable durability and rock-solid stability to keep your mattress in shape for years to come. And our latest quick assembly version gives you total confidence when it comes to setup, requiring fewer bolts and ingeniously designed with easy to use, tool-free brackets. With our simple, step-by-step instructions on hand, youll have this foundation built and ready to use within minutes. Built with a strong and durable steel frame and a versatile poly jacquard cover that slips right on, the Smart BoxSpring is the picture of dependability for any mattress. All packed in a compact shipping box with everything included, even our 5-year worry free warranty! Now thats peace of mind you can sleep on.Steel Interior Frame With Poly JacquardTWIN XL DIMENSIONS The dimensions of this XL twin size box spring are 78.7 x 38 x 9 inches. The length is 5 inches longer than our Standard Twin size. Please measure your bedframe to ensure compatibility.EASIER THAN EVER ASSEMBLY As if its ultra-durable steel structure and convenient packaging werent impressive enough, this new box spring features tool-free locking brackets for intuitive setup, assembly takes only minutes to completeDURABLY ENGINEERED Durable steel is used to construct the inside framework of this foundation; twin/twin xl sizes support a maximum weight capacity of 350 lbs, while Full, Queen & King sizes can support up to 700 lbsTHOUGHTFULLY PACKAGED All parts and instructions are packed into one compact box that ships straight to your doorWorry-free 5 year limited warranty included; box spring only, a bed frame or platform bed is required to support this foundation and is sold separatelyProduct informationProduct Dimensions78.7 x 38 x 9 inchesItem Weight25.5 poundsManufacturerZinusCountry of OriginChinaItem model numberZU-ABS-9XSFabric TypeSteel Interior Frame With Poly JacquardMaximum recommended load350 PoundsCare instructionsWipe with Damp ClothAssembly requiredYesWarranty DescriptionWorry-free 5 year limited warranty included.Batteries requiredNoIncluded ComponentsSteel Frame, Cover