Coir mats are made from coconut husk fibres. Coconut fibre provides strong brushing action. They are designed to sit at access points. Shoes passing over the fibres release soil. This reduces the amount of debris entering a building. From Coconut Husk to Entrance Mat Coconut shells provide the raw fibre. https://franciscodcxyu.uzblog.net/an-introduction-to-coir-mats-52667411