Waterproof zippers are specially designed fasteners that prevent water from entering through the zipper teeth. They are commonly used in outdoor gear, such as rain jackets, swimwear, and backpacks, to keep contents dry in wet conditions. These zippers often feature a rubber or plastic coating that seals the zipper when closed. The construction of waterproof zippers typically includes a unique interlocking design that enhances their water resistance. Some models also incorporate a protective flap or tape over the zipper to further block moisture. This makes them ideal for activities like hiking, boating, and skiing, where exposure to water is likely.