Natural coir mats use fibres taken from coconut shells. Coconut fibre provides strong brushing action. The structure suits doorway placement. Shoes passing over the fibres release soil. Less dirt reaches internal floors. The Origin of Coir Mat Materials Coconut shells provide the raw fibre. The material is treated before shaping. https://halway-runner14555.pointblog.net/understanding-coir-entrance-mats-88915809