The Heavyweight Hoody is built with comfort stretch fleece insulation and a form-fitting hood to add warmth and concealment across the gamut of conditions. Offset seams on the shoulders improve range of motion and comfort while wearing a pack and thumb loops keep sleeves in place when donning and doffing as you layer. Channeled fleece insulation adds breathability and works to control moisture buildup while Permanent Polygiene Odor Control Technology neutralizes odor by stopping the growth of odor-causing bacteria and fungi during the long hike in.