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ColdGear Reactor adapts to your activity level for the right breathability & warmth for what you're doing. Ultralight fabric has a unique hex-shaped pattern that traps some warmth but still breathes as you run . Stretch-mesh panels under the arms & across the shoulders for strategic ventilation. 4-way stretch construction moves better in every direction . Material wicks sweat & dries really fast . Anti-odor technology prevents the growth of odor-causing microbes. Reflective logos deliver greater visibility on low-light runs.