TPU, also known as thermoplastic polyurethane, is more cut and tear resistant than regular rubber. It is abrasion resistant, and has a high degree of transparency. Slim and lightweight: It's very sleek and thin so your phone barely feels different, it's the perfect size. If you're looking for something that is cute, small, and protective, then these cases are your best choice. They make your phone attractive without adding the bulk. Free access to all functions: The microphone holes, charger port, and speaker holes are all fully exposed with direct access due to the carved openings in the design of the case. With these on, no functions will be interfered.