Certified by IPEMA.org via TÜV SÜD of America to meet ASTM Standards F1292-13 and F2075-09. Unlike some other types of mulch, our playground mulch is carefully controlled as to type and size of wood fibers. This means that the fibers knit together to provide a surface springy enough to cushion falls, yet firm enough for wheelchairs. Another advantage: Rain water passes through playground mulch, so kids can play right after it rains. Finally, it simply looks good. The varied colors of natural wood please the eye and blend in with any kind of setting.IPEMA Certified – Click here for installation and certification instructions.