Coir mats are produced from natural coconut fibre. The husks are processed to form a dense mat surface. The fibres create a stiff brushing action. The design supports effective dirt control at the door. They are often used in doorways and porches. They are used inside buildings and under canopies. https://daltonkwmyh.ampedpages.com/an-overview-of-coir-entrance-mats-66708315