With lofted fleece insulation and a high zippered neck for fine-tuning your microclimate, the Heavyweight Zip-T keeps you comfortable in cold conditions. Permanent Polygiene® Odor Control Technology neutralizes odor by stopping the growth of odor-causing bacteria and fungi. The Heavyweight Series is the midlayer solution for static hunts in cold-weather or intermittent activity in frigid conditions with a lofted fleece backer that retains warmth while actively moving moisture away from the skin.