ramp or wedge of foam, cork, leather, or other material laid inside the shoe, on top of the footbed, to raise the heel of the foot within the shoe
Internal heel lifts are used as orthopedic modifications for leg-length differences, some foot deformities, and limited ankle range of motion. They are also used by some with healthy feet to increase the perceived height of the wearer in shoes without height-increasing modifications, like elevator shoes or shoe lifts.