Strong and Durable Steel MODERN STYLE, EARTH FRIENDLY WONDERBOX(TM) - This boldly outlined foundation has 16" of underbed clearance, and it’s shipped in a box designed to leave a smaller carbon footprint HEADBOARD COMPATIBLE - This frame is designed to easily attach to your own standard-sized headboard using predrilled holes in two of the legs; headboard not included NO BOX SPRING NEEDED - Durable metal slats support and extend the life of your spring, memory foam or latex mattress without a box spring; twin size supports a maximum weight capacity of 350 lbs, while all other sizes can support up to 700 lbs EASY ASSEMBLY – All parts, tools and instructions are shipped straight to your door in our new, earth-friendly WonderBox(TM); easy assembly in under an hour with a friend’s help WORRY-FREE WARRANTY - A limited, 5-year warranty covers any manufacturing defects; mattress sold separately