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The pile height is measured in millimeters. It is the length of 10 fibers from the infill to the tip of the grass. Pile heights gauge can read from 10mm up to 45mm. Pile height between 15mm to 25mm are common, and the pile less than 15mm or longer than 25mm are not recommended Artificial grass will fall over permanently is the grass is not supported and greater than 30mm.