Coir mats are made from coconut husk fibres. The material has a naturally rough texture. They are designed to sit at access points. Shoes passing over the fibres release soil. This reduces the amount of debris entering a building. How Coir Fibre Is Produced Coconut shells provide the raw fibre. https://judahkjzdu.onesmablog.com/what-defines-a-coir-door-mat-80155235