Coir entrance mats use fibres taken from coconut husks. 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. Coir mats are commonly placed at entrances. They are used inside buildings and under canopies. https://antislipmats82567.pointblog.net/understanding-coir-door-mats-89239381