Coir mats are made from coconut husk fibres. The material has a naturally rough texture. This makes coir mats suitable for entrance use. The mat surface scrapes dirt from footwear. Less dirt reaches internal floors. The Origin of Coir Mat Materials Coir fibre comes from the outer shell of coconuts. https://rylantcgjk.onesmablog.com/an-introduction-to-coir-mats-80159163