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