Natural coir mats use fibres taken from coconut shells. These fibres are stiff, coarse, and durable. They are designed to sit at access points. The mat surface scrapes dirt from footwear. Less dirt reaches internal floors. How Coir Fibre Is Produced The husk surrounding the coconut is the source material. https://emilianojxbfo.ampblogs.com/what-defines-a-coir-door-mat-76165273