Looking for a firm mattress

A firm mattress may or may not be the same firmness consistently across the sleep surface. Sometimes this is a problem, but some companies engineer their mattresses this way deliberately. In effect, they adjust a firm mattress to have a little more “give” in places where there is going to be more pressure, particularly at the shoulders and hips. This way, you get your spine aligned properly, and yet offer extra support for the lower back and abdomen.