Spy optic flyer sunglassesspy optics flyer sunglasses are made of virtually indestructible grilamid with interchangeable 8 base polycarbonate lenses these stylish sunglasses feature spy optics happy lens a colour and contrast enhancing lens technology that provides 100 uv protection whilst maximising the transmission of the suns good rays reduces pressure eliminates foggingthey also feature pin hinges hytrel nose pads and temple tips for a comfortable fit even in rainy conditions an