Coir entrance mats use fibres taken from coconut husks. These fibres are cleaned, dried, and pressed into matting. The fibres create a stiff brushing action. The fibre texture scrapes mud and debris from shoes. Many homes and premises install them at access points. They perform well in covered external spaces. https://knoxnjduk.tribunablog.com/an-overview-of-coir-entrance-mats-54131464