Helium UL Bivy Sizes:OS Embark on your next adventure

Embark on your next adventure into the cold wrapped in the comfort of merino wool made to protect against the elements

easy-to-carry package

accessory loop for pick-up bags or small attachable leash accessories

moisture-wicking power of merino wool makes these socks so dam good you're covered on both fronts

ventilated

Helium UL Bivy Sizes:OS Embark on your next adventureWaterproof Protection Without the Weight. The Helium UL Bivy is built for ultralight backpackers, climbers, and fast packers who need waterproof protection and breathability in a minimalist shelter. Made with bluesign approved Pertex Shield NetPlus fabric from 100% recycled nylon, the Helium UL Bivy is newly updated for 2026 to deliver durable, lightweight performance with a fully seam taped design and waterproof PU coated floor for reliable weather