Coir entrance mats use fibres taken from coconut husks. The raw material is treated and shaped into firm matting. The fibres create a stiff brushing action. The fibre texture scrapes mud and debris from shoes. Coir mats are commonly placed at entrances. They are used inside buildings and under canopies. https://hallwayrunners91223.bloggazza.com/38558156/understanding-coir-door-mats