Waterproof zips, also known as waterproof zippers, are specially designed fasteners that prevent water from entering through the seams of bags, clothing, and other items. They are commonly used in outdoor gear, such as rain jackets, swimwear, and waterproof bags, to keep contents dry in wet conditions. These zips typically feature a rubber or plastic coating and a unique interlocking design that creates a tight seal when closed. This design helps to block moisture while still allowing for easy opening and closing, making them practical for both everyday use and extreme environments.