Outdoor Research Helium UL Bivy Colour:Spice Every detail of the product

Every detail of the product has been rigorously tried

ensuring safe drinking water in any outdoor environment

Coreloft™ Compact insulation retains warmth even if wet and has loft retention that withstands years of packing and unpacking

Designed for longevity

Shorter shoulder straps and shorter hipbelt make the Thunder 50 Womens ideally suited for the female physique

Outdoor Research Helium UL Bivy Colour:Spice Every detail of the productThe 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 protection. Dual passive ventilation flaps