Strong and Durable Steel With Plywood Slats MODERN STYLE, EARTH FRIENDLY WONDERBOX(TM) - Featuring a minimalist steel frame and wood slats, this modern bedframe is shipped in a box designed to leave a smaller carbon footprint PRACTICAL AND RELIABLE DESIGN - The 14-inch steel platform features 12.9 inches of underbed space for storing extra odds and ends NO BOX SPRING NEEDED - Reliable wood slats support and extend the life of your spring, memory foam or latex mattress without a box spring, supporting up to 350 lbs (Narrow Twin and Twin) and 700 lbs (all other sizes) EASY ASSEMBLY - All the parts, tools and instructions you need for easy, two-person assembly in under an hour are efficiently packed and shipped in our new, earth-friendly WonderBox(TM) WORRY-FREE WARRANTY - A limited 5-year warranty covers any manufacturing defects; mattress sold separately