Cocoons OveRx polarized sunglasses are designed to securely and comfortably fit over a wide range of prescription eyewear frame sizes and shapes. The patented frames are constructed from extremely durable ballistic nylon and feature the Polaré lens system that exceeds the highest level in lens quality, the Class 1 European Standard for optical clarity and performance. All styles feature adjustable Flex2Fit® temples that enable each wearer to custom contour the temple shape for an exact fit that is extremely comfortable and secure. All Cocoons sunglasses feature a manufacturer's limited lifetime warranty and come with a cleaning cloth and neoprene case.