Your feet are the only part of your body that are constantly in contact with the ground. If they're in pain, chances are the rest of you is too. Enertor Comfort 3/4 Length Shock Absorbing Insoles are created to absorb shock in the heel and midfoot. Designed by leading podiatrists and endorsed by nine-time gold medal winner Usain Bolt, you're in good company adjusting your walking, jogging and running form.