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Built for flash-storm protection, the Helium II™ is 6% lighter and 10% more breathable than its predecessor. An ultra-compressible piece you'll never leave behind, it offers 30% more waterproof protection than the original. The Helium II™ is so light and packs down so small, you'll forget it's stuffed in your pack or clipped to your harness until you throw it on to ward off a sudden mid-route downpour. Compressible to the size of a granola bar and completely waterproof, the Helium II™ doesn't waste space or add more than a feather's-worth of weight.