To support the foot or not support the foot? That is the question and the subject of this post.
Some followers of this blog are asking whether they should use custom insoles, aka orthotics or footbeds, in their ski boots. My views on issues pertaining to the structures of ski boots and interventions in general that affect the physiologic function of the user are predicated on whether they accommodate and support the physiological processes of the user and especially whether the proponents of specific structures and interventions can support their positions with explanations predicated on sound principles of science and especially whether the explanations will withstand intense scrutiny. In addition, any explanations, conclusions or claims made should be based on the actual environment in which the use is occurring. Conclusions made in an indoor environment, or even in a controlled laboratory setting where gravity is the sole external force acting on the subject or subjects, cannot necessarily be applied to skiing maneuvers where the forces are both three-dimensional and dynamic in nature.
The question of whether the foot should be supported or not in skiing can only be answered by putting the issue under the high powered lens of the microscope of sound science.