Ideal for garments with knitted wicking linings or gear that should not be machine washed such as single wall tents & bivy sacks. Reduces the water-absorbency of the outer fabric, optimizing breathability. Quick and easy application can be used anywhere, anytime on wet or dry fabric. Lasts several washings. Safe on Gore-Tex, Ultrex, and Entrant. Non-aerosol, non-flammable and environment safe.