Notice 1. The floor mat is made of diatom mud, it is hard rather than soft. Since this diatomite bath mat is hard, please avoid hitting the mat when you step on it. 2.If you feel micronized powders on the surface, it is not a quality issue but a normal phenomenon of the productive process. You can use damp cloth and lightly rub away. 3.Please put the mat in a well-ventilated place to air dry and do not expose it directly under sunlight for a long time. 4.Do not use detergents containing surfactants and dip into water. 5.Do not step on this bath mat with your shoes, otherwise the stains will be sucked. 6.Do not use on the uneven ground or soft ground and also not on the sharp object.