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Living up to its name, the Outdoor Research Helium Down Jacket is an incredibly lightweight and warm insulating mid-layer, ready for all of our demanding alpine adventures. The Pertex Diamond Fuse face fabric offers lightweight durability from trailhead to summit, while the goose down keeps our core warm throughout the coldest days. Plus, it can be stored inside its own pocket, so even if it's not always needed, it's always there.