When you see an item of clothing in an advertisement with water beading beautifully on the surface, its not the waterproof membrane itself, but a perfectly functioning surface treatment. The treatment wears away over time with use and washing, but with this product you can reproof your favorite garment! One-liter container of wash-in treatment for waterproof and breathable clothing. For best results, washing with Tech Wash before reproofing is recommended. Lasts through several washes. 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 treatment 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