Futon mattress fillings vary from the economical off cut pieces of foam to the higher quality eco-friendly natural fillings, coil and cotton, pocketed coils with and without memory foam of felt and wool. The possibilities are endless. Futons are an alternative in some cases to a bed or other furniture, and are often sold in sets that include the mattress and frame. Futons normally feature a removable and replaceable cover in a variety of colors to match evolving modern decorating tastes.
The futon is based on the Japanese original, with several major differences. It is almost always placed on a configurable wood or metal frame for dual use as a bed and a chair or couch. Typically, the frame folds in the middle, allowing the futon to be used as a couch, and flattens for use as a bed. It is usually filled with foam as well as batting, often in several layers, and is often much thicker and larger than Japanese futons, resembling a traditional mattress in size. 
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