A stable core of lofted knit fibers prevents fiber migration to keep a uniform consistency, even after heavy wear and repeated laundering. By keeping moisture vapor moving freely through the fabric it increases overall air exchange and drastically speeds up dry times. This reduces discomfort from saturation and prevents it from turning into a sponge. 

Additional durable water repellency in the outer woven layers give Polartec® Alpha® the trusted ability to perform in the most challenging of environments. ed for the U.S. Special Forces when they required a more advanced insulating material in their combat uniforms. 

This fabric is a new technology with active insulation that regulates core body temperatures during both dynamic and static activities. This latest advancement in adaptable breathability helps eliminate the need of shedding or adding layers while on the move.