Mellow 9-inch high profile heavy duty box spring provides the look and functionality of a traditional box spring with longer-lasting stability made from sturdy, durable steel. Its 9-inch high profile helps provide better shock absorption and increased ventilation. This box spring fits with all standard size bed frames and is available in a Grey and Navy fabric. Enjoy quick and easy assembly with simple step-by-step instructions and all the needed tools included in the package. All Mellow box springs come with a 5-year manufacturer's warranty.