A golf club head that allows a user to customize the location of the center of gravity. The present invention also provides for synthetic turf infill cooling particles comprising a layer of water-absorbing material coating a foundation comprising a core substrate. On embodiment of such a method comprises depositing a first conductive material on a workpiece to form an electrically conductive first layer that conforms to the workpiece. Accordingly, the very short optical paths as well as the very long optical paths in the switch are eliminated, thereby minimizing the variation in the optical path lengths.