Yes indeed, from what I read on Polartecs site they have been supplying the military for some time now.
'When the U.S. Special Forces needed an active insulation that worked during both resting and dynamic phases in the field, we worked together to develop an advanced breathable insulation technology that dries quickly, retains warmth, and circulates airflow. Polartec® Alpha® performed so well that it is now standard issue for the U.S. Special Forces. This invention alone spurred entirely new categories available to the demanding and innovative military apparel markets.'
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