Perfect for the fast and light adventurer, the Helium II Jacket from Outdoor Research provides complete weather protection for only 6.4 ounces. This jacket has been revamped making it lighter, more breathable, and able to withstand nastier storms thanks to its Pertex 2.5L fabric. An adjustable hood and hem, elastic cuffs, and zippered chest pocket offer much needed comforts without sacrificing extra weight.