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The idea is easy: when you step into a 3D theater, they generally give you a (very) cheap pair of passive 3D glasses that have a poor fit, low peripheral vision, and absolutely not build to the best optical specifications. Oakley's 3D Gascan are built to a far better standard, and most likely represent the best passive glasses that consumers would be able to get their hands on right now. There's no question that when compared to standard glasses, Oakley possibly wins by a mile in terms of distortion and comfort. However, this excellence comes with a price: $120 (in Black or White). That's not "pocket change", but Oakley would also argue that you look actually goofy with the theater free glasses.