Zinus 14" Black Metal SmartBase® Tool-Free Assembly Mattress Foundation, Twin XL A ONE-AND-DONE SOLUTION - Why buy both a bed frame and box spring for your mattress? Our sturdy steel SmartBase® lets you enjoy the benefits of both; and fear not - this hardworking frame only requires opposable thumbs to set-up NO BOX SPRING NEEDED - Platform is made with heavy steel that replaces your box spring, allowing you to rest your memory foam or spring mattress directly on top; legs have plastic caps to protect your floors UNDERBED STORAGE - Total of 13 inches of clearance space under the frame provides valuable storage room for extra odds and ends QUICK, TOOL-FREE ASSEMBLY - Shipped in one compact box and requires no tools for assembly; rest your mattress directly on top of the platform; single frame sizes support a maximum weight capacity of 750 lbs, while other sizes up to 1500 lbs Worry-free 5-year limited warranty included; mattress sold separately See our assortment of Zinus products