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Serengeti sunglasses have patented "Special Control" filters that interact with the full spectrum of light and selectively block and filter each wavelength. Because of this, contrast is improved and objects appear more sharply defined. The Serengeti Spectral Control technology is not a coating. It's molecularly engineered into the glass itself, so it will never wear off and the sunglasses will never wear out.
The lenses on Serengeti sunglasses block 100% of UVB light as well as at least 98.5% of UVA rays; these percentages exceed all government and commercial standards. The lenses also feature an anti-reflective coating on the reverse side to block glare and back reflections.
With Serengeti sunglasses be assured you're wearing the right glasses because they feature photochromic lenses that adjust to changing light conditions on their own. The lenses darken in bright sunlight and lighten in overcast conditions, activated by the amount of UV light in the atmosphere.