Layering Position This is a highly versatile piece designed to be worn either as your final, outer layer in chilly to moderate temperatures or as a layering component under insulation or rain protection. Features Exclusive 37.5 Active Particle Technology Exhausts moisture and maintains core body temperature Traps odors (human signature) and releases them when laundered 20.5 micron, superfine, Merino-X wool 300gsm midweight interlock merino fabric Body-mapped insulation through the chest and upper arms - 60g 37.5 insulation Stays warm whether dry or wet Zippered, chest stash pocket Ergonomic hood Full-zip front