We try to make our shoes as comfortable as possible, so sometimes we use a super-comfy and cushy soft rubber. The flipside to this is that they wear quickly (think of the difference between soft and hard rubber pencil erasers). We always have a steady stock of replacement heel lifts that any cobbler can easily replace them with. Connect with a Fluevogologist through our online Live Chat (just click the box in the bottom right-hand corner of your screen to start chatting), or contact a store for more information!