Have a cotton jacket that you absolutely love, but wish it was a little more practical for the wet weather? Then look no further than the Nikwax TX Cotton Proof Formula! This revolutionary wash-in formula can be used in washing machine or by hand with your cotton, polycotton, or canvas garment to add water repellency to your garments with no need to tumble dry afterwards. The product activates during air drying, and will not affect the cosmetic appearance of your clothing. Ideal for jeans, jackets, and rucksacks, the Cotton Proof Formula maintains the breathability of the piece, and inhibits damp rotting of canvas products. This eco-friendly formula is biodegradable, non-flammable and non-hazardous.