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Panoptx sunglasses are designed for those who engage in more rugged sports like motorcycling, snowboarding, and military and/or tactical activities. The Velocity series offers a snug fit around the eyes to keep out dust, dirt, and rushing wind. The Speed series offers the "Air Dam," which allows air circulation, when needed. Other styles have variochromatic lenses, which automatically adjust to varying light conditions, changing tint from a light copper to a dark gray. You can test this by covering half the lens and exposing it to sunlight. Best of all, with a little research, you'll find the entire line available at discounted prices.