Some brands describe their mattresses as “universally comfortable,” though this usually means the mattress is around a medium or medium-firm firmness (5 to 8 on the firmness scale). A universal comfort mattress may be tempting because it can take the stress out of choosing a mattress firmness, but there’s not a “one size fits all” mattress. Although medium and medium-firm mattresses provide a balance of comfort and support, you may need more or less support and cushioning.