Coir

Coir, also called coconut fibre, is a plant fibre extracted from the outer husk of coconut, used in products such as floor mats, doormats, brushes, and mattresses, as well as horticulturally in potting mixes and soil amendments. In some countries it is locally called coprah. Coir is the fibrous material found between the hard, internal shell and the outer coat of a coconut.

Brown coir, made from ripe coconut, is further used in upholstery padding, sacking, and horticulture, and white coir, from unripe coconut, for making finer brushes, string, rope, and fishing nets.
Coir will float in water, so can be used in long lengths in deep water without adding weight that might drag down boats and buoys.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0