The Under Armour Unstoppable Swacket Jacket will deliver ultimate style and warmth. Featuring the ColdGear Reactor insulation which adapts to your activity level to keep you cooler when you start to get too hot. Coldgear wicks moisture from the skin and circulates body heat, keeping you warm, without weighing you down, whilst the infrared technology incorporating thermo-conductive coating absorbs and retains body heat.