A favorite amongst our Pro back-country athletes, the advanced lightweight shell features zonal Omni-StretchÔ and zonal ACMTÔ technology. Heavy-duty shell material is used in high-wear areas, while ultra-stretch lightweight shell material is used in the back, giving the rider maximum mobility. ACMTÔ across the chest and down the back, provides maximum waterproofing and breathability in contact areas with your sled and pack, and a single layer Tri-Laminate fabric is used in the sleeves and front body to eliminate as much weight and bulk as possible.