Mellow's 8-Inch Classic Bonnell Spring Mattress is a bedroom essential made with supportive innersprings for durable and even support. The heavy duty bonnell spring base is met with a top layer of comfort foam and a smooth poly jacquard fabric cover with fiber padding to add just the right amount of cozy comfort. All Mellow mattresses are designed with you in mind, made with CertiPUR-US certified foam to meet high standards of content, performance and durability. Our mattresses in a box are conveniently delivered straight to your door with easy setup and a 10-year manufacturer's warranty.