No box spring needed! The user-friendly Retro Walnut Wooden Platform Bed features an embedded platform that keeps the mattress in place. Its slatted surface ensures good ventilation and even support for mattress. A 6 inch thick mattress is recommended. Has 12 inches of storage space underneath the bed for stowing away extra pillows/blankets/etc. The retro-style headboard adds a touch of elegance to any bedroom.