Polarchromic Brown
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Polarchromic:
Is a new technology that Smith developed and owns, and it is well worth the cost. The unique feature is that it incorporates the polarize features of reducing glare, but also allows the lens to adjust to the lighting as it changes. If it is really bright the lens will essentially darken to give you more protection. If it is dark, than the lens will adjust to lighten and give you the ability to see well.
It is revolutionary technology and if you plan to wear sunglasses a lot and be by the water it is well worth the investment.
