THIS IS AN ADD-ON PRODUCT TO THE PRICE OF THE REGULAR PRICE OF SOLE OR HEEL REPAIR. The price is for the pair and is available in black, brown or white. This product is spliced in the heel area after the repair is complete. The material has a harder durometer than the traditional Birkenstock soling material. As a harder material it should wear longer than the traditional Birkenstock material, but it may also have a firmer/harder heel strike when going through the gait cycle.