The term Japanese Mattress is often used to refer to a type of mattress known as a FUTON. A FUTON is a traditional Japanese bedding consisting of padded mattresses and quilts that are laid directly on the floor. It is usually made of cotton or synthetic fibers, and is often used in place of a regular mattress. Futons are lightweight and can be folded up for storage when not in use. They are also popular in other countries, such as the United States, where they are often used as an alternative to a traditional mattress.