Serengeti CarloMossy Tortoise /Polarised Drivers LensesSerengeti Carlo is a more masculine take on classic Wayfarer sunglasses. But here a subtle keyhole bridge adds character to this instantly-recognisable acetate frame. It's comfortable and durable too. Metal detailing and subtle branding apply the perfect finish.Plus these polarised sunglasses boast Serengeti's patented Spectral Control. This fine tunes light transmission – making colours are naturally richer and the view is breathtakingly clear. And Spectral Control also helps block most blue light (this type of light usually damages eyes and causes eye fatigue).Carlo's lenses are also photochromic. So they lighten and darken with the conditions (even inside the car where UV is minimal). While polarisation beats blinding glare. So there's no more squinting. Instead eyes can relax.This one features Serengeti's famous Polarised Drivers Lens. Designed especially for the road, it makes colours from objects even more vibrant. And it's adapted for all driving conditions. Plus contrast is amped up.UV400 lenses. Serengeti sunglasses come with a one year manufacturer's warranty.