Serengeti Unisex Bormio Sunglasses Injected Nylon Grilamid TR90 Photochromic - react to UV light, adapt to all light conditions, enhance your vision 555nm Blue lens - reflective blue dielectric mirror coating, reflects more glare and improves contrast Highest-quality injected Nylon TR90 - fashionable frames, exceptionally light, chemically resistant, and extremely flexible and comfortable Megol temple tips and nose pads - absorb moisture, keeping frames securely in place Serengeti lenses - perfectly adapt to changing light conditions