This is a non-infilled, high-grade nylon yarn system designed for heavy-traffic tee lines, hitting mats, and extended use by golfers. This product is used by many of the top golf courses in the U.S.This product holds a real tee and allows players to hit all clubs, from wedges to drivers. While it does not replace natural grass, it serves as an excellent alternative, allowing grass time to heal properly.This product can be installed indoors or outdoors on concrete or a compacted aggregate base.