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From running to working out in the gym, the Ten Thousand Lightweight Short-Sleeve Shirt is one of the most seasoned pieces in our gear closet. The Ten Thousand Lightweight Short-Sleeve Shirt is an athletic performance shirt made with an abrasion-resistant and breathable polyester fabric to keep us comfortable when working up a sweat. The permanent anti-odor silver ion treatment helps keep us smelling fresh, and the breathable, durable fabric ensures it is our go-to shirt for all sorts of workouts.