Under Armour Aggression ColdGear Mock Neck Top Synthetic ColdGear accomplishes the impossible: it keeps you wamr without weighing you down Moisture Transport System - Under Armour's signature Moisture Transport System wicks moister from your skin, keeping you dry and your body temperature consistent in any condition Ideal Use: Temeratures under 55F/13C Fit - Fitted and Contoured. This is not a tight fitting top.