Wash-in treatment for waterproof and breathable clothing. For best performance, washing with Tech Wash before applying the treatment is recommended. Withstands several washes. When you see water beading beautifully on the surface of a membrane garment in an advertisement, what youre actually looking at is a well-functioning surface treatmentthe actual membrane only begins to fight water once the treatment wears off and the fabric gets soaked. This machine-washable treatment is not recommended for garments with a moisture-wicking lining. For such garments, use Tech Wash detergent and TX.Direct spray, applying the spray only to the outside of the garment. The wash-in treatment does not damage lined garments either, but it may reduce their breathability until the next wash. Contains no PFC compounds. Instructions for use: After washing the garment, run a short wash cycle with Wash-In treatment added to the detergent drawer. Dry at room temperature or on a low tumble dryer setting.