The Achilles Shield Sport is designed to protect the Achilles tendon area from abrasive new footwear and heel blisters. It is the more athletic version of the Achilles Shield providing greater shock absorption, and recovery from compression. Its surface also has improved non-slip properties, keeping the Achilles Shield Sport in place at the heel of your foot during fast-paced activities. It is ideal for breaking-in new shoes, cleats and cycling footwear that are painfully stiff out of the box, or continuous use in athletic shoes and boots for the added support. That way you can break-in your shoes, not your feet.