STABIL: Anatomically shaped heel bed lifts the back of the heel (7.5mm in size Medium and 9.5mm in size Extra Large). The heel insert then tapers from the back of the heel to the edge of the insert which covers the entire heel area. Firm, high quality moss rubber provides a stabile platform for the body. The surface is made of durable, vegetable tanned leather. Lifting the heel relieves stress on Achilles tendon. Stabil can also be used to compensate for uneven leg lengths. Self adhesive.