Otterbox Symmetry - Protective Case Style Matters The combination of two materials makes the Symmetry Series one of the thinnest, most secure smartphone case series in its class. Style and protection in one Fitting your phone into this sleek, lightweight case is incredibly easy. Despite its minimalist elegance, the Symmetry Series case is one of the most durable cases in its class. It is made of two materials that combine to provide effective protection and a great look. Style Matters A smartphone case is not only about protection, but also about a look that will match your style and personality. The Symmetry Series offers a range of patterns and colors, so there is something for everyone.