The 9" ComfortCoil #708 Twin black duct futon mattress features a medium firm surface feel with a custom-designed supercenter innerspring unit and layers of high resiliency foam and cotton.With 39" x 75" dimensions, this twin size futon mattress provides exceptional comfort and support like the best conventional mattress. The ComfortCoil #708 includes a 13.5 gauge bonnel spring unit with 2 pieces of foam and 30 lbs of Gold Bond Joy cotton batting.The technical specifications include an American made 312 coil innerspring unit, providing a restful night's sleep. This futon mattress is made from 9" cotton, foam, and innerspring construction, and the black colored futon fabric is covered with 100% polyester.