Zinus Gene 14 Inch Metal Deluxe SmartBase Mattress Foundation / Platform Bed Frame / Heavy Duty Steel Frame / Box Spring Replacement / Underbed Storage, QueenOUR STRONGEST MATTRESS SUPPORT Strong may be an understatement; this all in one foundation, made with heavy duty steel, can support up to 4400 lbs; all while doing the jobs of both your box spring and frame and giving you back some underbed clearance space too NO BOX SPRING NEEDED Platform is engineered with heavy gauge steel wires that replace your box spring, allowing you to rest your latex, memory foam or spring mattress directly on top of the