DWR (Durable Water Repellency) coating is the outermost finish applied to exclusive 686 infiDRY® fabrics increasing their contact angle and thus repelling water and enhancing infiDRY®’s waterproof qualities while maintaining high breathability. DWR also helps repel stains and oils that can damage your outerwear’s surface. 686 uses C6 environmentally conscious DWR.