Coir door mats rely on processed coconut fibre. The material has a naturally rough texture. They are designed to sit at access points. Foot traffic activates the cleaning action. This reduces the amount of debris entering a building. The Origin of Coir Mat Materials Coconut shells provide the raw fibre. https://coir-entrance-mats27146.tinyblogging.com/understanding-coir-entrance-mats-83382807