With its minimalistic approach, The Halsey Sofa Bed by Sealy is the ideal all in 1 piece to have in your home. Whether you are just lounging or about to call it a night the Halsey is prepared. The built-in mattress makes it quick and easy to transition from sofa to bed and vice versa when needed. The Sealy 5.5-inch Posturepedic Full Size Mattress ensures comfort and back support. The top 2/3 of the frame is an aluminum anti rust cage and the bottom 1/3 is cloth webbing. The aluminum cage keeps the mattress secure from movement and provides comfort. NO more of that dreadful bar in the middle of your back and you or your guests complaining of back pains. The cloth webbing adds to the comfort of the sit.