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Training Tech Long Sleeve is a lightweight baselayer with a design that is engineered specifically for high intensity workouts. It is made from an ultra-lightweight and elastic material that provides the best possible freedom of movement. Strategically placed mesh panels under the sleeves, around the chest and on the back, ensure optimal ventilation. Training Tech helps you keep your body warm and dry, even at high activity levels, while staying comfortable against the skin. It fits just as well under a jacket as when used alone for both inside and outdoor use.