Zinthu za TPU ndi thermoplastic polyurethane, zomwe zitha kugawidwa mu poliyesitala ndi poliyesi. TPU filimu ali ndi makhalidwe abwino kwambiri kupanikizika kwambiri, elasticity mkulu, mkulu kuvala kukana ndi kukana kukalamba, ndipo ali ndi makhalidwe abwino kwambiri chitetezo chilengedwe, sanali poizoni, mildew umboni ndi antibacterial, biocompatibility, etc.