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How does polarizing work?:

Multi-layer Polycarbonate Construction:

Advanced manufacturing techniques allow the Bi-Focal element to be formed on the inside layer of the lens, making it virtually undetectable from the front.

Lens Color Technolgy

Our lens-tint technology centers around visible light transmission, or VLT (the amount of light reaching the eye after passing through the lens), and is measured as a percentage. “All purpose” sunglass lenses typically range in VLT from 15-25%, sunglasses designed for high glare situations, such as crossing a glacier, have a range in VLT from 4-10%. Water sport sunglasses generally have a VLT between 10-20%.

Hidden Bifocal Construction

Advanced manufacturing techniques allow the Bi-Focal element to be formed on the inside layer of the lens, making it virtually undetectable from the front.

Grillamid BTR Frame Details