Outdoor Research Women's Helium Jacket:
OR's most compressible storm shell, the Women's Outdoor Research Helium Jacket is so light it practically f, or at least it’s so light that you won’t notice you’re carrying it until a sudden downpour bursts into your day. When a big, exposed objective puts you on route for a full day stretching into dark, this jacket packs into its own pocket and can be clipped to your harness for quick access if you need protection from rain, wind, or cooling temps. And it includes all the features needed for true functionality, without any bulky excess.