The achilles is the largest tendon in the body. It connects the calf to the heel of the foot and can withstand a great amount of stress. Despite its strength, it is still susceptible to overuse and degenerative injuries. Achilles Tendinitis most commonly causes pain at the heel of the foot due to inflammation of the tendon. BioSkin Foot and Ankle braces are designed to reduce inflammation, alleviate stress on the tendon, and restore function to the joint.