To rest well, the head, neck and spine must remain aligned and the pillow serves precisely this purpose. In fact, a good pillow must support the head and neck, helping to maintain the spine in the correct position, so as to offer relaxation to the muscles and promote good breathing. The ideal pillow does not exist in absolute terms, to choose the right one you must start from your habits, in practice the position in which you sleep, and physical characteristics, such as body type and height.