Built around a reinforced steel frame rated at 3500 lbs, this queen size box spring provides dependable mattress support that resists bending and sagging over time. Standing just 4 inches tall, the low profile design pairs well with thicker mattresses while keeping overall bed height comfortable for easy entry and exit, and it works on a bed frame or directly on the floor. A shrink-resistant, removable fabric cover keeps the mattress from sliding and washes clean to maintain a fresh sleeping environment, while smooth rounded corner guards protect against bumps and scratches when you move it through tight bedroom spaces. This is the queen box spring only a mattress is not included. Everything needed arrives in one package with clear instructions, so the foundation assembles in minutes.