To do and notice
Draw a line lengthwise down the middle of each sole. Place
the protractor so that its center is at the approximate center of the shoe's
heel. Measure twelve degrees of arc along the curved back of the heel starting
from the center line and moving away from the arch side of the shoe. Mark
the edge of the heel at twelve degrees.
Starting with either shoe, note where the heel has broken
down. Ideally, the heel should be worn away equally on either side of a
line from the heel's center to the twelve-degree mark.
Now check the ball of the foot. In a "normal"
foot, an area across the ball and evenly spaced with regard to the midline
has scuffed away.
Finally, examine the tip of the shoe. An ideal gait causes
maximum wear along a line running under the first and second toes.