STRONG, DEPENDABLE, AND READY IN NO TIME - As if its ultra-durable steel structure and convenient packaging weren’t impressive enough, our original Smart BoxSpring has been given a quick-assembly upgrade DURABLY 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 all other sizes can support up to 700 lbs EASIER THAN EVER ASSEMBLY - With fewer bolts and tool-free locking brackets for intuitive setup, assembly takes only minutes to complete THOUGHTFULLY PACKAGED - All parts and instructions are packed into one compact box that ships straight to your door Worry-free 5 year limited warranty included; box spring only, a bed frame or platform bed is required to support this foundation and is sold separately