Tifosi eyewear amok interchangeable sunglasscycling specific sunglasses that come with three lens and a quick interchangeable system. The glasses frame comes with a grilamid tr 90 frame construction which is incredibly lightweight whilst retaining great levels of strength. To help keep the glasses in position and for a comfortable fit they come with an adjustable nose piece.lensesthe glasses come with three lenses and an easy to use interchangeable lens system. Each lens provides full uv protection and is made of super durable polycarbonate.ac red ndash 41.4% light transmission suited to moderate, mid ground lighting conditions.clarion red ndash 14.5% light transmission best to suited bright lighting conditions.clear ndash 95.6% light transmission works best in extremely low lighting conditions such as night time rides and inside training sessions.features3 interchangeable lenses included ac red, clarion red, and clearadjustable nose piececomes with protective caseglare guard technologygrilamid tr 90 frame constructionhydrophilic rubber detailingoptically decentred designpolycarbonate lens constructionfull uv protectionventilated lens designbuy tifosi eyewear from chain reaction cycles, the world's largest online bike store.