Natural coir mats are made using coarse coconut fibres. The husks are processed to form a dense mat surface. The fibres create a stiff brushing action. The fibre texture scrapes mud and debris from shoes. They are often used in doorways and porches. They perform well in covered external spaces. https://natural-coir-entrance-mat59998.blogoscience.com/45751532/understanding-coir-door-mats