Mountain Shades Redline PhotoMatic Sunglasses (Shiny Black with Clear Lenses) Color:Black Sizes: M (52-57 cm /

Sizes: M (52-57 cm / 20

Adult sizes: S

100% natural

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Mountain Shades Redline PhotoMatic Sunglasses (Shiny Black with Clear Lenses) Color:Black Sizes: M (52-57 cm /Photochromatic lens automatically adjusts to the changing light conditions to darken or lighten depending on the amount of sunlight or UV exposure. Reaction time is 7 to 10 seconds, and the transmission shift is from a Category 1 (85% light transmission) lens, to a Category 3 (15% light transmission) lens. An advanced crystal is embedded in the lens resin that reacts with the intensity of the sun to create the change. The lens material is grade A