The warmest base layer we have ever created. The ultimate for cold-weather conditions, Polartec® Thermal Pro® has the highest warmth-to-weight ratio of any Polartec® fabric and is ideal for layering because it doesn’t bunch like other heavyweight base layers. Three weights of Thermal Zone body-mapped material provide superior heat retention with undeniable comfort for all-day hunts in extreme cold conditions. Heaviest-weight material provides optimal heat retention and warmth for exposed areas. Offers the highest warmth-to-weight ratio of any Polartec® fabric and delivers at least 30% more warmth than the competition’s high-loft offerings. Midweight fabric covers less-critical areas. Lightweight material in high-heat areas wicks moisture to minimize discomfort. Treated with Polygiene® antimicrobial odor-resisting technology. Imported. Sizes: M-2XL. Color: Loden.