As anyone who has ever maintained a baseball or softball diamond would agree, the pitcher's mound and batter's box present a special challenge. […] Batters dig in at the plate, disturbing the soil and making a hole that base runners must slide across when they approach the plate. To withstand the special stresses on these areas, only clay-based soils provide the necessary soil strength. […] [S]ome manufacturers have introduced clay-based soil products for pitcher's mounds and batter's boxes. These products include additives with special binding properties and are specifically designed to resist the stresses applied by the cleats of pitchers and batters.