As in firmness, I prefer to be right in the middle with a Medium, I like being able to sink into the mattress but since I sleep on my stomach, I need it to be firm as well
I am pretty much the same. I like something that I can sink into but that is also firm for when I sleep on my stomach. I hate anything that is just hard and feels like you are sleeping on concrete or a board or something. Has to be so I am comfortable and it has to be just right.