Severe wear and tear on the outside of the heel of the shoe sole is generally not related to the shape of the foot, but is mostly related to incorrect walking posture, such as the habit of walking with a splayed figure, etc. It may also be seen in people with mild foot pronation. Outward-shaped walking habits: Bad walking habits of pointing your toes outward and pulling your heels together when walking can increase the pressure on the outside of the heel and reduce the pressure on the inside. If you walk for a long time, it can cause serious wear on the outside of the heel. If the splayed walking habit is not corrected in time, it may lead to knee varum.