This model is the Serengeti Firenze Espresso Driver. It is NON Polarised so suitable for flying and has a standard bayonet fitting. Finished in dark brown with exclusive photochromic lenses which automatically adjust to changing light conditions.
Probably the best drivers and pilot sunglasses in the world. Serengeti sunglasses improve the ability to see detail, depth perception and colors through the use of their unique photochromic glass lenses and spectral control technology.

Serengeti sunglasses have the only commercially available sunglass lens that automatically darkens in bright sunlight, then automatically lightens as it gets darker. It's not a coating - it's molecularly engineered into the glass. The result? Better, more comfortable vision, no matter what the daylight conditions. The Serengeti sunglass lens also features an anti-reflective coating on the back surface to reduce eyestrain. Serengeti's precision engineering doesn't stop at the lenses. Serengeti's award-winning, ergonomically designed frames are made from some of the world's most advanced materials: stainless steel, nickel-silver, graphite, nylon, and cellulose acetate. Order a pair of Serengeti sunglasses for the ultimate driving experience.

Many believe Serengeti Sunglasses to be the best sunglass lenses ever created with award winning frames and an ergonomically designed style for fit and comfort, mean as soon as you put on a pair of Serengeti sunglasses you will not want to take them off.

• UV Protection - A Serengeti Sunglasses lens blocks 100% of UVB light and no less than 98.5% of UVA rays, exceeding all government and commercial standards. The Serengeti Sunglasses Lens also features an anti-reflective coating on the reverse side to block glare and back reflections.
• Blue Light Filter Blue light waves are responsible for "veiling glare" as they scatter off dust and moisture particles in the air. These shorter wavelengths can't be focused by your eyes, creating a problem known as "blue blur". Serengeti sunglasses lenses block and filter 95% of blue light, virtually eliminating blue blur so reducing eye strain and tiredness.
• Lens System - By interacting with the full spectrum of light , Serengeti's patented Spectral Control filters block and filter each wavelength creating bright and vibrant colours. Contrast is improved so objects appear more sharply defined. Your eyes to relax and see everything remarkably crisp and clear as the glare is virtually eliminated.
• Precision Optics - Made from distortion-free, precision ground and polished optical glass, Serengeti sunglasses give you the clearest image available. Scratch resistant and chemically tempered for strength, each and every lens is drop ball tested with a steel ball to ensure maximum impact resistance. With proper care, Serengeti lenses can last a lifetime.
• Photochromic Technology - Featuring a photochromic lens exclusive to Serengeti Sunglasses which automatically adjust to changing light conditions. Activated by the amount of ultraviolet light in the atmosphere, the lenses darken in bright sunlight and lighten in overcast conditions. It's not a coating - it's molecularly engineered into the glass. And because the technology is engineered into the glass, it can never wear off or wear out.
  
  Serengeti Sunglasses are Highly recommended as the ideal pilot sunglasses of choice.