Heel lifts

Heel lifts also known as shoe inserts are commonly used as therapy for leg-length differences leading to knee, hip, and back pain, to reduce stress on the Achilles' tendon during healing, and for various rehabilitation uses.

The intent of one is not to absorb shock or spread pressure on the foot, but to raise one foot in order to shift balance and gait. As such, these products should be firm and not compressible, in order to add a constant amount of height without causing the heel to rub vertically in the shoe.