What’s the best mattress for a futon?

What sort of futon mattress is right for you will come down to what you’re going to do with it. Those for Japanese-style floor use – that is, sleeping – are normally between three and five inches deep, and are best on tatami or hard flooring. Futons meant to go in sofa-beds are, as a rule, six to eight inches thick to be good for both lounging and lying down.