The Outdoor Research Helium UL Bivy is a 511g waterproof, breathable shelter for climbers and fastpackers who'd rather leave the tent at home. Updated for 2026, it's the version to choose if you want recycled fabrics, proper ventilation and stakes in the bag.
The upper is bluesign® approved 2.5-layer Pertex® Shield NetPlus® with a hydrophilic laminate, in 100% recycled 30D ripstop nylon, fully seam-taped over a PU-coated 40D nylon floor. Two passive ventilation flaps let moist air out overnight, so you wake with less condensation. A clamshell opening and a single DAC aluminium pole make it surprisingly roomy for a bivy, and the high-volume toe box keeps your feet from feeling trapped. It comes with six stake loops and four aluminium stakes, reflective trims and a no-see-um mesh panel. Pick it in Light Pewter or Spice, on its own or with the Vestibule for covered gear space.
Product Details
Colour: Light Pewter, Spice
Vestibule option: UL Bivy, UL Bivy with Vestibule
Material: 2.5L Pertex® Shield NetPlus® with hydrophilic laminate
Weight: 511g (18.02 oz)
Why you'll love it
Ultralight protection – full weather protection in a compact, packable shelter
Waterproof and breathable – Pertex® Shield NetPlus® fabric, fully seam-taped
Less condensation – dual passive ventilation flaps
Comfort where it counts – high-volume toe box and clamshell entry
Quick to pitch – single DAC aluminium pole, six stake loops, four stakes included
Options: UL Bivy on its own, or UL Bivy with Vestibule
Who it's for
Intermediate and advanced alpine climbers, fastpackers and lightweight backpackers, and anyone who wants a dependable emergency shelter on exposed terrain.
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