You can pump up your Sleep System's base higher to for more rigidity, but it is really a personal preference on firmness. The pump's gauge goes lower than 7 PSI. Many people tend to stop pumping well before 7 PSI, as long as you are reaching a rigidity in the base you are satisfied with that's all that matters! Once you've slept on the System a few times you'll start to get a feel for what firmness is most comfortable for you.