Natural coir mats use fibres taken from coconut shells. The material has a naturally rough texture. The structure suits doorway placement. Foot traffic activates the cleaning action. This reduces the amount of debris entering a building. How Coir Fibre Is Produced The husk surrounding the coconut is the source material. https://andrejgvnc.ssnblog.com/38140006/what-defines-a-coir-door-mat