Tifosi slip sunglassestifosis slip sunglasses offer top quality features at an amazing price and include three interchangeable lenses to give you optical clarity day or night a microfibre cloth to keep them clean and a case to keep them safe virtually indestructiblethese sunglasses are optically de centred to eradicate distortion and prevent unwanted magnification the frame is constructed from virtually indestructible grilamid tr 90 plus vented scratch resistant and shatterproof polycarbonat