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Looking for warmth in the extreme cold or spending extended periods out in chilly weather? The incomporable performance of HEATTECH Ultra Warm innerwear is here. 2.2x thicker and warmer than our regular HEATTECH Jersey, this collection of thermal tops and thermal bottoms fends off intense cold with ease while sitting comfortably beneath the rest of your outfit. It's our most powerful, most insulating HEATTECH yet.