The Achilles tendon attaches to the heel bone joining the components of the calf muscles. It transfers the strength of the calf muscles to the bony structures during movement. The area where the Achilles tendon attaches to the foot is one of the most heavily stressed regions of the human body. This is especially true during exercise.
The shockabsorbing cushion has a two-part structure, encloses the Achilles tendon and serves as a buffer between foot and shoe, thus preventing pressure and friction.