The Ambiance features a unique 12" spring, cotton, and foam futon mattress compressed to finish at 6" thick. The core is made of 560 individual pocketed cells, surrounded by four layers of cotton polyester blend and two layers of convoluted foam. It is designed to take the constant folding and unfolding that is typical of futon use. Unmatched in quality in comfort, the Ambiance is a must if you plan on using your futon for more than occasional use. The Ambiance virtually eliminates the transfer of motion by tossing and turning, making your sleep the ultimate escape!