Made with an all-new, highly absorbent material called GEM, this bath mat will soak up water quickly, dry naturally, and has a pleasing organic texture that feels great underfoot.A unique mixture of Keisodo (diatomaceous earth) and vermiculite creates a complex and highly porous structure for superior, all-natural absorption. The center line has a depression to enhance absorb-ability and prevent the mat from sticking to skin.Note: This product is meant to be used on flat surfaces only.