Designed to keep you dry in the event of a downpour, the Outdoor Research Helium II jacket is a lightweight backcountry essential. Made with a super-breathable Pertex Shield fabric, the jacket is highly compressible and packs down to the size of a granola bar. It's been fully seam-taped for total waterproof protection. The jacket also features an adjustable hood, a YKK AquaGuard center-front zipper, a zippered Napoleon pocket, and an internal pocket that doubles as a stuff sack. Rounded the jacket out are elastic cuffs, a drawcord hem, and a carabiner loop. Fully seam-taped with an adjustable hood, the Helium II features a YKK AquaGuard center-front zipper, a zippered Napoleon pocket, and an internal pocket that doubles as a stuff sack. Rounded out with elastic cuffs, a drawcord hem, and a carabiner loop, it’s cut wide enough for layers and long enough to tuck into your waistband, so you can head out prepared no matter the forecast.