A productive, fulfilling day starts with a great night's sleep. Is your mattress giving you the deep, restful sleep you need? This hybrid mattress offers a combination of heavy gauge tempered steel innerspring coils and high density foam for ultimate, medium-firm comfort. These springs are covered with high density foam that is CertiPUR-US certified for your peace of mind. The mattress is compressed and shipped in a box so you don't have to struggle to carry a mattress through doorways or up stairs. Simply open the package and give the mattress 48-72 hours to fully expand. This bed in a box is ideal for all sleepers and the design is perfect for platform beds, bunk beds, trundles and more. If you're looking to improve the quality of your sleep, this mattress is the answer.