Purple 5" Queen Flat Foundation provides low-profile, reliable support for a Queen mattress, combining a compact silhouette with steady performance. A polyurethane core delivers consistent, even support across the surface to help maintain proper mattress alignment and extend useful life. At 5 inches tall, it functions as a box spring alternative that fits platform beds and low-profile frames while allowing airflow under the mattress. Made in the USA, the foundation installs quickly for an immediate, practical upgrade to your bed setup.