Coir mats are made from coconut husk fibres. These fibres are stiff, coarse, and durable. 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://sethkljea.blogofchange.com/40050108/an-introduction-to-coir-mats