A footbed for supporting a person's foot is formed with one or more voids which removes support beneath either at least part of the heel which is lateral to the midline of the heel and which does not extend medially of the midline, or beneath the medial process of the tuber calcanei, or a combination of the two. Such voids stabilise those parts of the heel which functionally form an abutment to support the medial and lateral longitudinal arches of the foot, in order to prevent pronation.
