New coatings make natural fabrics waterproof - the process could offer nontoxic alternative to environmentally harmful chemicals, it combines short-chain polymers, which don't accumulate as easily or persist in the environment, with a coating process called initiated chemical vapor deposition.

See the source article by following the link below:
New coatings make natural fabrics waterproof - the process could offer nontoxic alternative to environmentally harmful chemicals, it combines short-chain polymers, which don't accumulate as easily or persist in the environment, with a coating process called initiated chemical vapor deposition.