The front and back sides of the Xperia Z are made of scratch-resistant mineral glass and to further protect the device, Sony installed a glass covering film onto both the front and back sides of the Xperia Z. This extra protection is hardly noticeable. The Sony Xperia Z is also IP 55/57 certified. This means that it is dust-resistant as well as being resilient against being sprayed by water and temporary submersion. As a direct consequence, all of the ports and jacks are hidden behind protective flaps.