What Is Waterproof Fabric?
Waterproof fabric is a natural or synthetic fabric that has been coated with a substance to repel water. Common waterproofing substances include polyurethane, polyvinyl chloride, silicone, and wax. The term “waterproof” applies to the fabric only, not the entire garment. Even if a fabric is entirely waterproof, the seams must be sealed or taped and the zippers must have storm flaps, or the garment is merely water-resistant.