... Tents, flexible covers 3) Bags and backpacks for daily use and outdoor activities such as cycling, biking, sailing, ... the nylon zipper teeth are arranged on a high-strength terylene mesh belt, a layer of TPU (thermoplastic polyurethane) ... the gap of the zipper belt to form a mixing layer with the zipper belt, and the ... the TPU layer of the zipper belt, and a convex edge is formed by adapting the TPU to ...