The Sealy Cleburne firm tight top mattress and box spring set is a reliable sleep solution designed to deliver firm support and consistent comfort. Its tight top innerspring construction provides a stable sleeping surface, while the included box spring offers a complete foundation setup. Adjustable base compatibility adds flexibility, making it ideal for achieving a supportive and restful sleep experience. Set includes mattress plus box spring/foundation/base. Larger size mattress sets may feature 2-piece side-by-side foundations for easier navigation in tight spaces.