Natural coir mats use fibres taken from coconut shells. Coconut fibre provides strong brushing action. They are designed to sit at access points. The mat surface scrapes dirt from footwear. This reduces the amount of debris entering a building. How Coir Fibre Is Produced Coconut shells provide the raw fibre. https://entrancemats69123.tribunablog.com/what-defines-a-coir-door-mat-53469399