Extremely thick! Approximately 15cm mattress "I want to sleep without feeling like I'm sleeping on the floor." A futon mattress approximately 15cm thick Fluffy! This voluminous mattress is made of firm cotton and has a body pressure dispersion function. Uses two cores of high profile urethane. The sleeping comfort is fluffy and soft! The two inner cores are interchangeable. This allows you to achieve the ultimate sleeping comfort that is perfect for you.