This product is made of wet cast, low moisture absorption concrete. Drivable Grass® is cast with holes to allow for infiltration and root penetration. A cast-inside engineered polymer grid allows Drivable Grass® to flex and conform to irregular ground surface contours along pre-defined linear grooves, while providing the intended structural support needed for daily use. Drivable Grass® maintains its load supporting characteristics even when saturated. The design also eliminates sharp edges common in other products, and won’t crack and break like rigid concrete or pop up like plastic.