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The mid-sized montana is the best of both worlds with both a bold front with sleek temples. The montana features the awesome happy lens and is available in trident polarization. The happy lens also keeps the eyes relaxed to reduce fatigue and help your eyes to easily distinguish changes in terrain. Happy glass polarized lenses allow in the sun's good rays (long-wave blue light) - that studies suggest create an uplift in mood and alertness - while still blocking the sun's bad rays, giving you the best visual experience possible.