Anti pronation shoes are specialized shoes to keep the feet from pronating. Does this mean that by using the shoes, the bottom of the feet would be tilted toward the midline or away from the midline?

Anti pronation shoes tend to tilt the bottom of the feet towards the midline.

Explanation:

Pronation is the natural motion of the foot while walking or running. A person either has neutral pronation, overpronation and supination.

In neutral pronation, the foot tends to move along the midline. In overpronation, the foot tends to move towards the left away from the midline while in supination, the foot tends to move towards the right away from the midline.

Since pronation tends to tilt the bottom of the feet away from the midline, then anti pronation shoes tend to tilt the bottom of the feet towards the midline.