The slim-fit Men's Summit FUTUREFLEECE LT Zip features a low-pile version of our full-loop fabric technology that helps minimize weight and optimize body temperature. It's designed to be worn over a base layer or under whatever insulation the mission calls for. Under-pack comfort is also prioritized with flat-locked stitching and no shoulder seams. Slim fit FUTUREFLEECE LT features lower-pile full-loop construction and octa-yarns to provide an optimal warmth-to-weight ratio No shoulder seams for reduced bulk and extra comfort while you're wearing a pack Underarm gussets for better mobility Reverse-coil, #3 center front half zip Flat-locked stitching in key zones for next-to-skin comfort Clean front hem with flat-sewn el...