Helium 15 Sleeping Bag Long

With an optimal ISO-tested comfort rating that teeters above or below zero, the Helium packs serious warmth in a super-packable 800-fill-power down bag designed to easily stuff into any overnight pack. A thru-hiking favorite, this high-performance bag provides lightweight warmth that’s also light on the Earth—perfect for when you're looking to maximize miles or speed in the mountains and minimize weight and space in your pack.