waxed fabrics

Wax impregnated cotton originated in the sailing industry. For centuries, sailors have been aware that wet sails are stronger than dry sails and have impregnated their sails with fish oil, and later with linseed oil and paraffin. As a side effect, impregnated cotton turned out to be waterproof.
Ecological Textiles developed its own variety of wax impregnated fabrics, combining organic linen and organic cotton with beeswax.