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. This reduces the amount of debris entering a building. How Coir Fibre Is Produced The husk surrounding the coconut is the source material. https://andresqutup.blogocial.com/understanding-coir-entrance-mats-75207904