Coir mats are made from coconut husk fibres. The material has a naturally rough texture. The structure suits doorway placement. The mat surface scrapes dirt from footwear. Less dirt reaches internal floors. The Origin of Coir Mat Materials Coconut shells provide the raw fibre. The material is treated before shaping. https://travispnfvk.blogocial.com/understanding-coir-entrance-mats-75307821