The surface of nylon airtight waterproof zipper is matte, and the materials include high-strength polyurethane ether and polyurethane ester. It uses liquid PU film-forming technology, where PU/TPU materials are poured onto fabric at high temperatures. This helps the materials bond closely with the fabric. In addition, the precise fit of the zipper teeth ensures a tight seal also making the zipper both airtight and waterproof. Its exceptional sealing ability makes it suitable for outdoor activities. It is widely used in products like ice packs, water walking balls, diving bags, tents, and other items requiring IPX-7 waterproof standards.