Questions about buying futon mattress or full size regular mattress for futon frame?

My dad is willing to give me a futon frame, however i dont want the matress with it (using it as bed frame).
I was wondering if it was a bad idea to use a regular full size mattress for the futon frame?
Also, wondering, if they sell futon mattresses

I’m looking for a mattress similar to "sealy posturepedic plush"

thanks


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