What holds the grass down and in place?
The grass’s own weight (approximately 1-2 pound per square foot) will usually be enough to weight down the grass, but some infill is required to help the fibers stand up naturally and prevent “matting.” Additionally, this infill will assist in weighing down the grass so it doesn’t wrinkle, shift or move. A combination of sand and rubber infill seems to be the most popular. Many people prefer the “soft” feel of rubber granule infill where use is greatest and use sand infill (it’s less expensive) for areas of the grass that see less traffic.