‘After visiting various pro, college and youth-level fields in 10 – 15 cities, Munson and Frandina settled on AstroPlay for a variety of reasons. One of the biggest was the field’s "G-max" rating, which measures the hardness of a ground surface based on vertical-drop tests. A measurement of zero is extremely soft; a measurement of 200 is extremely hard. Natural grass is an 85, and AstroPlay is close, "around an 85 to a 95," Munson says.’