fabrics that have been treated to resist wetting and shed water by causing the water to bead on the surface. It does not close the pores of the fabric as waterproof treatments do, so the fabrics are comfortable to wear. It will offer protection in a light shower but not heavy rain. Water repellency may be added by treating the fabric with fluorocarbon chemicals , wax, silicone or resins . Sometimes called water resistant.

Additive which exudes to the coating surface and forms a thin, transparent and durable protective barrier. The coating surface becomes hydrophobic and has non-wetting and water-proofing properties.

Hydrophobic substance resistant to penetration by water but not entirely waterproof (polysiloxane liquids, fluoro-surfactants, soaps of multivalent metals, metal-organics...).