Starting off strong the Helly Hansen LifaLoft Air Men's Insulator Jacket has pocket placement designed to accommodate a harness or pack straps and a low-profile hood designed to fit under a helmet. Lightweight and breathable Pertex® Quantum AIR fabric paired with LIFALOFT™ insulation by Primaloft® in a light layer that traps heat while allowing humidity to pass quickly through for thermoregulation, this glides under a shell as an insulator, stuffs into a pack as a warmer when needed, and is a casually light jacket for autumn weather. Without the bulk of a fleece or feather piece this gives you comfortably easy movement in a piece you can layer under or over depending on the requirements of the day. Easy care, fluff and wear, with the technical materials to keep moisture moving so you stay comfortable and focused on the trail ahead.