GRASS MAT 1.8MGrass mats are handmade using 100 % natural grass and contain no treatment of any kind. These grass mats are ideally suited for indoor purposes only or in a dry outside area (the beach). Grass mats will absorb water and need to be dried out immediately by hanging in a well ventilated area, however it is advisable not to get them wet too frequently as this will shorten their lifespan.