You may hear futons described as a three-seat, love seat, lounge, click-clack bed, dorm futon, or bunk bed futon. It is best to read the description thoroughly to better understand the type of futon they are selling and if it will fit your needs. The description of the futon will typically supply the dimensions of the futon mattress. If the dimensions are 60x80, then this is a queen mattress and most likely a three-seat futon.
Secondly, it should be borne in mind that it isnt the futon frame that provides the comfort when either sitting or sleeping on a futon: it is the futon mattress that provides the comfort. A futon bed mattress made for a tri-fold futon frame is not as thick as that for a bi-fold futon bed frame. Therefore, if you intend to sleep on your futon regularly you might be best to buy a bi-fold futon bed mattress: a thicker mattress tends to provide more support.
Rigidity of a futon bed mattress is more important when the futon is being used mainly as a sofa. Flexibility basically defines how easy folding the futon mattress is going to be. If you are going to folding the mattress daily from sofa to bed back to sofa again, then buying a futon bed mattress with a lot of flexibility makes sense. Futon bed mattresses are made from a variety of materials.
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