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One of many recent innovations in the sunlens arena, Silhouette sunglasses' Voyager line been referred to as "state-of-the-art" technology since its recent launch. Silhouette's Austria-based Research and Development team, sunlens maker Christian Dalloz, and NASA's Astronaut Corps banded together to design this unique line. The lens is made from a polycarbonate substrate and treated with a proprietary soft brown/bronze mirrored tint designed to provide reduced light transmission. Their frames are made with a lightweight titanium that weighs as little as three paperclips...although in space that probably doesn't matter as much as down here on earth!