Coir door mats rely on processed coconut fibre. These fibres are stiff, coarse, and durable. This makes coir mats suitable for entrance use. The mat surface scrapes dirt from footwear. Less dirt reaches internal floors. From Coconut Husk to Entrance Mat The husk surrounding the coconut is the source material. https://antifatiguemat38470.thenerdsblog.com/45456450/understanding-coir-entrance-mats