The Hyperion Sleeping Bag 32F Down is an ultralight sleeping bag designed for shoulder season backpackers. It features hydrophobic down for reliable warmth in cold, wet conditions, ergonomic shape with a longer zipper for comfortable fit, and zoned insulation placing 70% of down fill where it is most effective. Its detachable connectors allow integration with a mattress. The insulation is sourced from humanely treated waterfowl.